There is a YouTube video of a guy doing it on an older Arctic Cat but the process is the same. I'm no mechanic either but I've done it twice now on 2 different sleds, 1 with reverse and electric start which adds a whole bunch of extra stuff to take off (and remember how it goes back on). Also lots and lots of threads with pics on this forum and others. Google "arctic cat drive shaft bearing" and you'll find plenty of info.
It's really not a bad job. Some guys do it without dropping the rear suspension. I think it's easier if you do and it gives you an opportunity to give it a good once over checking the wheel bearings, shocks, replace sliders if necessary. Also a good time to change/upgrade your track if you're considering that.
Pay attention to how things came off and take lots of pics as you go to refer back to if you get stuck and can't remember something.
An extra set of hands is very helpful if you have someone that can help you.
Feel free to PM me if you have any questions or post them here...lots and lots of help available.
Dave