Russell,

I agree with the non safety suggestions. You can shoot it off of a string until you understand how things work. I think you have been at this long enough to single out your release and concentrate on doing it properly, the rest of your sequence is second nature. Once you get the BT release to be second nature (subconcious), all you'll have to think about is the spot you want to hit. Give it a while though, it probably won't happen overnight.

I have yet to prefire one and have never used a safety. It did however, scare the poo out of me there for a while.

As for which one, there are many great hooks out there and nothing feels better (to me) in the hand than a nice rotation release. I have a Trutension and a Longhorn (both 4 finger) and they are incredibly comfortable to use. They all work pretty much the same so you'll just have to figure out which ones feel the best in your hand. Big shoots where the manufacturers set up booths are the best places I know of to try several of them.

Have fun with it!

-Chief