Chat with your instructor prior to the class.
Best case would be to do some shake down dives b4 the course.
You spent the coin learn on your own gear.
What are the other options, rental gear?
The above being said takes me back to 1998, decide to do a NAUI deep diver specialty with my brand new Cressi reg set (why I ever bought those is beyond me
).
Was living in North Bay, Ontario Canada at the time.
Day one no issues just doing build up dives in a lake close to home.
Day 2 we head up north to what was known as Spring Lake, I'll leave the temps to your imagination its fall in the great white north and we r diving wet.
Buddy and I gear up, Instructor sets up his lawn chair on the beach and pulls out his thermos of coffee.
Ok guys I want you to enter here, follow the btm down to 120', hang there for 10 mins ascend to 20' and swim back to shore.
What can I say young and stupid the instructor is always right.
Head down to 120, hangin there, wtf is all that noise and why r there so many bubbles down here.... we r totally narc'd.
Relise my primary is full out free following, switch to bu start pushing the purge try to stop the FF, not happening.
Look at my buddy, all I c is the whites of his eyes he is totally freaking out.
Make a free accent on my own with spg in hand watching my pressure drop, 1/2 way to surface I decide to stop the FF by folding the primary hose over and clamping in my fist.
Amazes me to this day I didn't take a DCS hit, the accent was lets say not so controlled.
Shake down dive would prob b a good idea.