dherbman:I've found that the easiest method is doff and don over the head. This works equally well on the surface or at depth. No struggle or twisted hoses and everything falls right into place.
Actually, this is a firefighters thing. With the smaller SCBA packs made from kevlar or even the old steel or aluminum tanks, its pretty easy with that gear. With dive gear weighing in a bit more it makes it impractical for folks who do not have the upper body strength to life 45-60# over their head and esentially flip a back pack on, it does take some strenth and control to not hurt yourself in this process.