To install the lift, you will need a grinder, some good jacks, jack stands, pitman arm puller, spindle nut socket, and a few minor specialty hand tools like for brakes. You can rent these at any Schucks or AutoZone. Other than that just hand tools. The Explorer is much more complicated than the Cherokee but still easy enough if you have friends and any clue.
For the lift:
Both Superlift and Skyjacker are great lifts. Superlift has had some problems but has fixed them. Unkike the Skyyacker, their kits fit the truck like they should. Their customer service is also top notch. My budy runs the Skyjacker and I have the Superlift. He had much more trouble with his than I did. But he has never broken anything like I have. He runs the 4" Stage II with a 2" body lift, nitro shocks, 4" rear springs, and the superrunner steering. I run the Superlift 5.5", extended radius arms, superrunner steering, SOA rear, RS9000 shocks, and ProComp add-a-leaf. I couldn't quote you prices but I have less invested then he does with twice the ride. For a daily driver such as mine, I strongly suggest the superrunner steering for any kit. You will need a drop pitman arm either way you go. I have drove my explorer cross-country twice now. Mine rides better than stock, handles better than stock, and flexes better than the Skyjacker. Mine also rides better then his. I believe this is due to the SOA and RS9000s. I removed the rear swaybar and modified some front swaybar disconnects from a CJ7. The extended radius arms ride a lot better also.
4wheelparts.com shows the Superlift 6" (5.5) with RS9000 and SOA for $900 (free shipping). I bought my Superrunner steering from them for $350 including shipping. Extended brake lines are about $120 and the Extended radius arms if you buy it with the kit is around $275.
I have almost a complete brand new Superlift kit sitting in my garage waiting for me to get home and install. Superlift warrenteed a bunch of my parts so the only used parts I will have on my truck is the springs. I wish I could make up my mind on a SAS and I could make you a deal.
Sorry for rambeling. Hope this gives you some ideas.