Do an internet search, there are several step by step how to's on the Web.
It is relatively easy for an experienced mechanic. As long as you have all of the tools you need, you should be able to pull it off (including welder and cutting torch). You will need a complete SRT-4 donor car plus you will need to purchase (or make your own) a mounting kit (the transaxle has to mount lower) and at least a STAGE 1 Mopar Performace upgrade kit.
You can also use a PT Cruizer turbo setup (GT Cruizer with manual trans), again you would need the complete vehicle. You need the MP upgrade kit b/c the SRT and PT cruizer engine control computer will only work on the vehicle it came from. There is a VIN # security scheme and century kit encryption that will prevent the engine from being started. From what I've heard you will need $4000-$6000 in your pocket to do this project.