I was going to suggest a baseball bat, a stick of chewing gum, and a pry bar
but that might be alittle messy
I'm sure there are probably a few "how to"s in the Audio area just gotta do a search,
to wire it up I know 1stMP3inNH has posted the diagram for all the wires, I do not beleve they sell a plug adaptor for the car yet
I installed a MP919 in my friends P5, had to wire it to the stock harness, getting the radio out was not to bad, although I dont know how it is on the MP3
I would PM 1stMP3inNH he can tell you EVERYTHING you will need to know, he knows the MP3's audio system better than anyone on this forum