Deep water packdown is explained on the free RNLI DVD. And in lessons, I have yet to meet anyone where the instructor did it for real..... it's more like, I'm going to tell you this is how you do it , but I can't be arsed to stand on the beach for an hr sorting out the tangles... if it all goes wrong do the following... keep one line under tension, avoid the sunken lines, don't deflate until told to by the rescue boat, keep knife handy, blow whistle, release flare, inflate bouyancy aid, call mates on beach with mobile in aqua pack, keep the board on etc... (cue safety flamers!!)
Also if money is really tight you can torrent Progression. No1 is on there if you know where to look (cue copyright is theft, flamers!!!!)