Mounting CD player in dash?

Hey guys,

I want to put my new CD deck into the dash of my 71 scamp....My question is, how should i go about doing it? I know i will need to cut the dash for the deck to fit, but my question is how much will i have to cut? How exactly is the CD player mounted in dash? do I have to buy one of those mouting plate kits from future shop or something and cut the dash hole to fit that? also, when cutting the dash is it better to cut it with it still in the car or out of the car? (just thinking of flexing while cutting)....if anybody has done any of this before i would love your insight, and maybe even some pics too8)