A new guy by himself? I would recommend you getting a friend or two to help out. You could really do this in a couple hours if you got all the right tools at hand, but if you have never done it before it might take a few days. Is this kit meant for a 91-94 explorer? You will need the kit specifcally designed for this model. Read the directions atleast 3 times before begining. It isnt the hardest thing in the world. Actually, a body lift was one of the first things i ever wrenched togeather, that was on anything bigger then a go-kart. haha
Just putting the body lift on isnt too hard. Everything is a breaze up until the front-two body bolts. These bolts can be a pain, if you have access to a torch that would be your best bet. There are a few threads about this (with pictures), try a search.
The bumper brackets arrent perfect, but they will work. Since you are lifting the body, you gotta lift the bumpers too (for them to be level with the body). You will need a Sawzall to knoch the bumpers in two spots so they can clear the frame rails, you will see where to cut when you try and put the bumpers on. If you want the bumpers to look factory, a drill press (to oblong out the bolt holes on the bumper-brackets) would come in handy. I used a dremel !! Took forever, but thats all i had to work with at the time.
The steering extension bolts in. About a 5 minute job there
The parking brake cable needs to be dropped. The kit should come with the hardware for this. This shouldnt take you longer then an hour if you have no clue what you are doing =)
The Fan-shroud needs to be dropped also. The kit supplies this, only should take you maybe 20 minutes to put back togeather.
While doing a body lift you want to keep in mind that you are sperating the body from the frame. There are a bunch of wires, hoses, lines, and crap that are all going to be 'stretched' out during this process. You dont want to bind anything up, so go slow, check and double check everything. It aint a hard process at all, a case of beer goes great with this job.