ive dipped and dabbled in it..its not terribly difficult jus not real simple. few words of advice make sure you get a noncontact thermometer so you can check the temp of the kydex sheet ehrm its in the oven, cause if you heat it to fast or to hot you will get some very serious shrinkage, always give your self more than you need to work with cause when you press it itll take up more materieal than you thought it would, best way to get good definition is to heat your mold foam so it dont snatch your heat out the kydex before you get a good a press on it and make sure you keep even pressure across the entire area of it( and dont skimp on the press foam it makes a diff, get the good stuff trust me youll save your self money in the long run) and as far as molding the gun with the kydex load a magazine with empty shells so the press dont push on a empty mag well so you dont crack anything. use blue painters tape( or something simlilar) to cover your gun to keep the kydex from being in direct contact with it. dont forget to use something to make the sight tunnel so the sights dont snag and keep it from comming out. last but not least press the kydex one side at a time and you can put them together after your done that way the fit together tight instead of trying to keep everything centered in the press.
ps: make sure you post some pix!!