You must have some serious cash to even consider buying an 01-02 Sport and then tearing into it!!
If you have that kind of money buy a 96+ and just pay somebody to do it.
I think the swap would be simple if you got a donor vehicle. After I pay mine off a bit I was thinking of doing it.
I had an 82 Ranger that I swapped a 302 into. I used some parts from a Maverick to fit it in. The computer was non-functional. (in fact, somebody stole the comp. while I had the truck torn apart!) I wired up what I needed and ran mechanical guages and stuff. This wouldn't be an emissions legal swap but at that time I didn't need emission testing. If it were an off road only vehicle it would be a lot easier to do the swap!
The engine going into the vehicle must be the same year or newer for emissions legality...so I'm told.