BVickery
Contributor
You've already been given great advise.
If you are already calm and comfortable underwater, and you reg is in good working order, then you should focus on the 4-1-4 breathing rythm and kick technique.
I find that frog-kicking makes a HUGE difference in SAC rate. It's a kick- g l i d e - kick. You spend most your time in the glide phase.
I know the treasure of advice I have gotten. My instructors have commented on how relaxed I am in the water. I honestly feel its my breathing rate and kick technique, when I'm under the water I am VERY calm and at ease. For me, its my 'happy place'. I may be a new diver, but I'm also 35, and had 2 previous attempts at getting Certified when I was younger fall through (one was equipment, other, well can't really do anything when you tear your calf muscle from the bone).