A full backup is a good idea, but I also would copy off any documents or anything you might want to keep that you don’t have backed up. Even if you just do so to some USB drive or to an SD card. Those copies will be faster than trying to image the whole drive.
I’d also take my advice about Chrome. Make sure you’re signed into a Google account, and set it to sync. Check out the directions here:
Turn sync on and off in Chrome - Computer - Google Chrome Help
To save your info to your Google Account, turn on sync.
That way you can just install Chrome on your new computer, then sign in, and it will offer to sync everything. That way you’ll be back to where you were. As someone who spends a lot of time in Chrome, it’s nice to at least have that be close to where I left it. And, once the sync is complete, (all extensions installed and everything), you can always turn it back off or even sign out.
BTW, if you do decide to just throw out the old computer, I wouldn’t mind taking it off your hands once you’ve gotten everything off of it that you want. I have an even older laptop that barely works. You can always take out the hard drive entirely if you’re concerned about privacy (or just tell me not to look and I wont). PM me if you’re interested.
Oh, and Windows 10 isn’t too hard to learn. I can give you some advice for dealing with some annoyances, but it’s really not any harder to actually use than Windows 7. The issues are the ads you’ll likely want to turn off, the updates you may want to delay (to avoid any problems), and maybe installing some old stuff from Windows 7 or tweaking some settings.
If you can get it without cost being a problem, it wouldn’t hurt to get a computer with Windows 10 Pro. It makes postponing updates (to make sure any bugs are worked out) much easier. But don’t avoid a computer that just has Windows 10 (Home).