Icontrol said:
Is it user-friendly?
More or less. It'll probably take you a while to figure out certain tools, but unless you're planning to make some really involved manips, I imagine the basic stuff will be plenty. Just don't be afraid to experiment every now and then, and it'll be alright. Personally I'd say figuring out layers, modes and filters should get you pretty far. Plus, we've helpful people here in the forums who propably wouldn't mind handing a little advice from time to time.
As for gif manipulations... As in manipping an already existing gif, or animating a still image with swirly eyes and the like? Frankly neither is my area of expertise, so I'd take the following with a heap of salt. Anyway, now that I've ruined my credibility, if the former, my advice is GIMP should be ok for it, but I can't recommend starting there because it takes a veritable eternity since you'll be working with dozens of layers, so work will be slow especially if you don't know the program a bit.
If the latter, GIMP should still be okay for the purpose, as long as you're not looking for the crispest 60fps spinny things or whatever. If you are, it'll still be a decent middle man for image manipulation, but I imagine you'll want a different program for the animation proper (again, you'll be working with layers upon layers, so being able to actually rotate a spiral or something with lines of code or however them programs work would be infinitely faster afaik).
Anyway, if all that's not to your liking yet, you can do surprisingly much with only a few frames. For reference, <<
hypnohub.net/post/show/38...clothes-cynthia-femdom-ha|this>> only has 5 frames total if I recall correctly, but looks pretty decent for what it is, I hope, because I took the time to calculate how the rings expand.