I think “how to get it up” has been covered, but may i suggest a light chain, rather than rope, for the final product? U have a bird feeder that the squirrels can’t quiiiite get to, and i routinely see one of the brighter squirrels attempting to chew through the chain. If it were rope, they would have dropped it ages ago.
My first attempt was with cordage . . . the squirrels chewed through it, replaced it with steel chain. Then the squirrels climbed down that.
Thin steel cable is the best choice.
Yes, the squirrels can climb down my chain, but my bird feeder has a smooth plastic shield at the top, like the tin Woodman’s hat, that is too big for squirrels to get around. So it works.
When they are very hungry, they try for the feeder until they fall, and then they eat the seeds that fell out as the feeder swung back and forth under the weight of a squirrel. 
Steel cable is hard to attach and detach, but it’s probably best.
I was thinking more of the way the cord/cable is attached (at the opposite
end to the feeder). If you can detach it to lower the feeder, then the squirrels
can too.
Pictures squirrels stealing a phone to go to AnimatedKnots.com to learn how to tie/undo them. 
Thanks @Turki-lurki. I had envisioned the slingshot method, actually. Thank you for confirming it. I pulled a round fishing sinker out of my tackle box a few weeks ago, thinking it may be a player in the starting line up of this endeavor.
Preach it! They chewed the paracord on feeder #1. They did it again before I bought the vinyl covered cable, and I had to install the cable twice. The first time I installed it, I used paracord to secure one end of the cable to the tree, and the squirrels sussed-out the weak point in my system. I’ve got some cable left, but surely not 60+ feet.
Woodsman hat is a great idea, @puzzlegal, I’ll entertain that approach, as well. I didn’t do it on feeder #1, and -every now and then- some commando squirrel will climb out there and empty the feeder. It doesn’t happen often, thankfully.
I like to kid myself that by occasionally feeding the furry guys that they feel the need to respect my boundaries and stay away from the bird feeders. HA! We tried that approach with the deer one season, too. Now we have no rose bushes.
This is my bird feeder. I like it so much that when it eventually cracked, i bought a second one. I’m delighted to see it’s still available for sale. (Although the one i have is still going strong.)
Another nice feature is that it’s perfectly sized for cardinals, and a little awkward for the larger birds. That doesn’t mean that grackles and bluejays never eat from it, but they don’t fit in it for a long time, because it’s a little uncomfortable for them. So the smaller birds get a chance, too.
You might want to to refer to this technical manual
I’m a ham radio guy and use a bow with fishing arrow to shoot a line over branches. The arrows have a sliding collar to attach the line. Then we use the line to support the antenna wires.
I’ve got a nice fleet of these kickass military poles for assorted antenna and yardwork uses. They were used for camo netting but they’re really strong and stack quite nicely. I wouldn’t use more than a few unattended but 30 feet to hang a line wouldn’t be crazy with a helper. It is deadly serious to observe powerline safety!
I used those poles for my 2-meter base-station antenna. They’ve been working great.
I was going to post something similar to the Camo Support Poles.
Years ago I needed to hang a tire swing from a limb about 30 feet up. I used the poles from my snow rake and fashioned a hook from a coat hanger, which I put into the end of the pole instead of the rake head. I put a weight on the end of the rope and used the pole to put the weight over the limb (kept the weight of the rope from pulling it down). I then used my hook from the other side of the limb to pull the weight down until I had both ends of the rope at ground level.
For the next ten years I was asked how I got the rope up there, and for some reason I delighted in not answering the question.
Unintended at the time, but it turned out that the really long rope made the swing way better.
Hey bird-feeders are persons as well - they may have family. If you have any problems with one of those, hanging them is no longer acceptable!
Take any problem to law enforcement.
Sheeesh
I have a snow rake as well. It’s gotten tons of use over the years, but hardly ever for snow. It’s almost always for jobs like this.
I should give an update since the thread’s been bumped.
My stepson came over on Sunday. He’s a fisherman, of sorts. I pitched my dilemma to him, and he felt that he could use his fishing pole to cast an egg-shaped lead weight over the limb. I was excited, and I ran in to get my coat. When I came back, he was off looking in the woods for the weight. It had come off his line during his practice cast. Ha! That was the end of that day’s activities, but we’re planning a second date.
Perhaps he and I should read the technical manual suggested by @abcdefghij.
When you said “Tin Woodsmen Hat” @puzzlegal, I assumed you were using some poetic license to describe a typical predator guard. Then I see that the feeder in your link is indeed wearing something quite similar to a “tin woodsman hat”. That would be effective as a deterrent and as a rain shield. I like the imagery of the squirrels approaching from above and sliding to their peril written in the vendor’s copy.
I don’t have the long support poles or a snow rake, and you guys make them sound quite useful. Now that I’ve learned what a snow rake is, I know why I don’t have one. Though we did just experience our first episode of ice dams a couple of weeks ago.
Mine is low enough that i fill it standing on a kitchen step stool. When squirrels fall off, they are just annoyed, not injured. And the wild swinging that causes always should a little seed, so they eat what they’ve spilled, off the ground.
Still, it does work surprisingly well to keep squirrels out of the bird seed. I wish i could keep out the starlings. They are large, and very messy eaters, spilling a lot of seed. I guess that makes the mourning doves and the towhees happy, as they like to feed off the ground. But the feeder empties a lot faster when the starlings go at it.
What the hell?
Try… e.g. this: Palomar knot - Wikipedia
I find steel wire good for suspending feeders. The squirrels don’t like climbing down it.
A womp rat isn’t much bigger than that.
That was my thought. A fisherman who loses weights off his line isn’t much of a fisherman. Idjit.