Beautiful fish and coral, what could go wrong? Sure there are damselfish, lion fish, wrasses, butterfly fish, and clownfish. But it is hard to learn to dive. Your mask gets water in it, your tank gets turned off, your regulator (mouthpiece) falls out of your mouth – all as parts of your training.
Imagine this: first you do the buddy check: B for BCD (air vest), W for weights, R for releases, A for air, and F for final check. Then you do a backwards roll into the water, fill your BCD, and signal the boat captain. Once your group is ready, deflate your vest, and down you go. Keep breathing and equalize pressure by swallowing or blowing lightly while pinching your nose.
Swim forward, belly down, and enjoy the dive.
This is how a dive should go.