Couldnt read the ENTIRE thread, too long.
But here's my input as a noob.
For the last year on this board I have heard:
"Don't Panic"
"You Don't Know What You Don't Know"
"Follow Procedure"
Yeah yeah yeah, I hear, and I agree.
Then last week, dive #27........
Standing on the swim platform, all suited up and ready to dive. I am 100% sure that I am 100% ready. So I put my regulator in my mouth and get ready to step into the water. Breath in from the regulator and NO AIR! Yeah, you guys with 1,000 dives are probably saying "Yeah? So what, you were ON THE BOAT IDIOT!"
Uh, yeah, well, it wasn't what I was expecting, I was expecting air, like the other 26 times I did it. My chest got tight, I got anxious. I leaned back on the boat so that I wouldnt fall into the water. I reached for my valve, it was off.
How can THAT be? I put air in my BC 5 minutes ago, how did it get turned off?
Here's my point. I didn't "need" to check my air. I KNEW it was on. I KNEW that I was good to go, but I wasn't. The only reason I checked is because:
"You Don't Know What You Don't Know"
so
"Follow Procedure"
On another note....
I have a dive buddy that I trust and respect, when I practice emergency drills he is there in case something unexpected happens. When what I dont know happens, its good to know that I have a buddy there to help out and laugh at me when its over.