IMHO this is something that should be learned under the guidance of a qualified instructor. There are many things to consider, most of which I am sure you could read about on this board or in books. The difference however, is when you actually do it, you would want someone knowledgeable there to assist in the event that mistakes are made or to critique your performance. Deep dives requiring deco stops need to planned properly for depth, time, gas mixes, etc. You should also be carrying at least one redundant air source whether it is a pony bottle, stage bottle, doubles, or even just an H valve. I also believe that someone who is planning that type of dive be VERY familiar with dive tables and carry a waterproof set with them in the event of a computer failure so they can calculate stops for themselves. However if the dive was properly planned and dove according to plan, they should have the depth and times of stops written on a slate and with them anyway.
Again, just my opinion, but if you are asking this question, once you get an answer it makes it very tempting 'try it just to see'. In my opionion there is no substitute for proper training on a procedure, then experience performing it. I avidly research diving information myself, just so that I can make an informed choice about what instruction I want to accquire next.
Dive often, dive safe
John
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