Taking apart a valve body for an overhaul

You'll be fine. Don't be afraid of it. Lay out some towels on your bench to catch fluids when you separate it. The main casting has the check balls so when you remove the screws the separate the body, make sure it is on the bottom so the balls don't fall out and roll away. Keep all the small parts organized and note where the check balls are. Your book should have pictures. In many case you don't have to disassemble and remove all the valves. On the valves you do remove, don't polish the edges or anything. They need to remain sharp. What you don't want to do is use anything that will leave chunks of lint behind while cleaning.

Keeping the detent ball and spring on the rooster comb under control is probably the toughest job :)

If you plan on installing a shift kit or reprogramming kit while you're at it (always a good idea on a stock trans), they'll have plenty of instructions and pics regarding the VB.