Since you know you aren't 100% comfortable with the skill, I would highly encourage you to work on it thouroughly intsead of mearly doing it a few times and moving onto the next skill. Make sure you and your instructor keep practicing the skill over and over again until, it's something you can do in your sleep. It's very important that you overcome your tendancy to bolt. It seams like the natural thing to do, but it can often do more harm than good. Learn to relax, think, continue to breathe and then act calmly to solve any problems or difficulties you may encounter while diving. Tis the recipe for a fun and relaxed encounter in the aquatic realm!
Sea you in the Deep Blue!
Sea you in the Deep Blue!