I bought a CD of the factory service manual off ebay. This is very useful to have - tells you how to do every procedure.
I buy oil filters online. Most Toyota online dealers will sell a V8 oil filter for around $3-4. While you are at it, might as well
buy a cabin air filter, engine air filter, wiper inserts, and gaskets for the oil drain plug and other plugs (f/r differential drain/fill plugs
transfer case drain/fill plugs). Most parts are interchangeable with the 4runner.
No special tools other than regular mechanic tools you can get from Sears.
I would do a search on all the 4runner boards and 4runner web sites. The 2UZ-FE engine is common across a lot of Toyota trucks,
so there is a lot of info out there on how to DIY most things. Not a whole lot of info specific to GX DIYs because most GX owners
are not going to do their own oil change.
Here's a good write up on an oil change (there's another one on clublexus too):
http://www.toyota-4runner.org/showthread.p...ight=oil+changeGood luck.