I use to work at a Toyota dealer and have done many of these trans services. It is the same procedure on 1987-2001 Camry's.
This trans has a 10mm allen drain plug, and the filter is just a metal screen that flushes itself everytime you shut off the engine. There is no need to drop the pan, as this is a LIFETIME filter. When draining the fluid make sure you have a 10mm Allen socket, and NOT a 3/8" socket, as it will strip the drain plug.
Also the Differential has a seperate drain and fill.
The drain is also a 10mm allen drain plug, and the fill is a 17mm on the back side of the diff. You can access this with a long 17mm box wrench. Granted this is assuming you are working on a 4 cylinder. The v6 has a seperate drain for the diff, but it fills from the trans.
Make sure that you loosen the Diff Fill plug BEFORE you drain the fluid. What good is draining the fluid, if you can't refill it.
To refill the diff you will need a fluid transfer pump, or you will need to get creative with a funnel, and some tubing from the top. The trans takes between 1.5-2 quarts when filled from the dipstick tube, and the differential takes about 2 quarts. All fluid is Dexron III/Mercon or equivilent and can be purchased anywhere. I'll try to find a diy write up. Many DIY'rs roast their differential because they don't know about the fill plug on the back side of the diff.
Good luck,
Justin