it is really simple, it is easiest with transfer case removed but can be done when installed, just involves more swearing. Basically it involves grinding on a shift rail and making or buying the stick and bracketry. The kit is only $135 and gives very good directions, but i couldn't really beleive how easy it is. http://jkwoffroad.com/offroadproducts.php
Might even be able to find something cheaper if ya shop around some.