Doing it yourself is probably the best idea, especially if you can put together a "wrenching" party ... offer pizza/beer! I've heard the Bushwacker flatty install is kind of a pain in the butt and takes awhile, but definitely can be done on your own. Do a search in the JK Tech section, there's probably tons of threads on the subject.
I've only used Tribe4x4 for stuff I haven't been able to do by myself, and Adam is awesome. Great work, reasonably priced. However, he's in Ft. Worth. Definitely worth the drive, though!