It’s a 1991 Subaru Justy. 3 cylinders, 1.2L, manual trans. I have the starter. But I just need to know how to do it? Anyone have any idea?
1.) Buy a Haynes book as its got pictures that come in handy
2.) Disconnect the battery
3.) Locate the starter on the car
4.) Figure out the best way to reach starter
5.) Take socket set, wrench set, use same to remove wires to starter
6.) Remove bolts/nuts holding starter in place
7.) Make sure buddy is standing by so that if you drop old starter onself and do greiveous bodily harm (some of those things are heavy) buddy can call 911
8.) Gently remove old starter
9.) Gently insert new starter (some have to be positioned exactly during the installation)
10.) Tighten nuts and bolts on new starter
11.) Hook up wires to new starter
12.) Reconnect battery
13.) Start car
How easy a job it is depends upon where the starter’s located and how heavy it is.
“1.) Buy a Haynes book as its got pictures that come in handy”
Now, thats a book I would like to see 
Step 4A.) Purchase metric tools
GET THE “DISCONNECT THE BATTERY” part RIGHT - Those pupopies draw enought current to fry you - disconnect BOTH terminals!!!
To find the starter - find the battery, and follow the big mother cable from the positive terminal - it terminates on the starter.
I hope your Haynes manual is better than the one for the Ford Ranger - mine is basically worthless. Relying too much on generic procedure descriptions without detail for the model you’re interested in. “Every book based on a complete teardown and rebuild” I think is their motto - yeah right.
I guess that should have been a Pit rant. As for the OP, yes, definitely get a service manual of some sort.
Replacement of Starter is in reverse order of disassembly, hope this helps.
Well 2 things. The starter was fine to begin with (I still replaced it). The motor had seized b/c the crankcase was bone dry. I added 2 quarts to the massive 1.2 liter 3 cylinder motor and grabbed the pulley and freed the crankshaft just enough to let the starter grab the flywheel and get everything moving. It was quite a day.
???
GAH!
You’re not going to “unseize” a motor by turning the pulley… let alone get it running again. More likely than not you had a spot on the flywheel minus a tooth or two, or the starter was mis-aligned somehow or the started drive/bendix (if yours has one) was shot.
Have fun.
No dude, it was seized. SEIZED! No missing teeth, nothing mis-aligned–just brute force and got a couple fingers stuck between the pulley and belt.
Regardless, the job is over and done with. If I could close my own threads, I would.