Ya you can defintly do it dude...just find a buddy whos got a garage (with air tools) and start on a friday night. I thought I could never do mine, I started friday night after work, finished sunday night. Took me about 20 hours. But no one was helping me and I had never done one before, and I ran into all kinds of problems. But, defintly you can do it.
As for the shift extender, it does make the throw slightly larger, but you get used to it in a day.
EDIT: oh and the hurst is short throw and mush smoother and better in every way, but, it costs almost $300.
03 Ranger Edge, 4.0L, 5spd std, 4x4, 4.10s
3" BL on 265/75/16 Definity Dakota MT/s
Tbar crank + 2" AAL
dumped flowmaster 44