It is a very simple job to do. You will definitely want a drip pan for dropping the tranny pan, I have taken a few showers in ATF in my time. If you were closer I would say come on by and I could give you a hand.

Whatever you do, don't pay the yahoos at the grease monkey or whatever $89 bux each for things as easy as diff fluids, it is highway robbery.

So you don't make as much of a mess with the diffs, you can pick up a cheapo vacuum pump from harbor freight or wally world and pull the gear oil out that way, then don't have to worry about diff gaskets, silicone, etc.