i'll tell you how i do it, which is very far from anything near as professional as you're talking, but the end result sounded pretty good considering i dont have turntables or anything like that. i take my song in cubase and first slow it down to the speed i wanted using the time stretch, then i use pitch shift to get the vocals to sound how i want and that takes care of the screwed part. then i just zoom on the waveform and wherever i want it to "skip" or chop, i just splice it and move it backwards or forwards. im sure michael watts would laugh if he read this, but it really sounds pretty good. ill post a link if you want to hear it. i dont know if this helps you or not, but i figure if this guy who's asking you this doesnt have the crazy kind of equipment that swisher house has he should be able to do something similar and get decent results.
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[I]Charlotte, NC/Gainesville, FL[/I]