I refer you to my blog entry on the subjected, reprinted here for your convenience.
[h=4]Student Divers: Don't Think too Much

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DivemasterDennis
, July 18th, 2011 at 08:37 AM (1398 Views)
I have been reading posts by dive students that are having problems with their certification dives, and want to share a thought with you all. Some problems reported are equipment related, and some pertain to conditions- cold water, poor visibility, and others relate to physiological problems, like an ear that won't clear or neck/back pain. But there is a recurring theme in the reporting, and it is that student divers who are having problems appear often to be "overthinking" the dives. By that I mean you may be focused so much on discomfort, or getting a skill right, that you are stressing out and creating problems that you might not otherwise have. My suggestion: HAVE FUN!". I am not saying to ignore an ear squeeze, or other comfort issue, but I am saying don't be preoccupied with it to the point of obsession. Also, remember you have done all the skills you are going to do in confined water, and can do them. In fact, many are actually easier to do ion the open water dives than in the pool. Don't overthink them and create stress. Relax and enjoy the experience. Whether you are in a quarry in Ohio, or warm seas off the coast of Florida, you should have fun on those certification dives. Look around, enjoy weightlessness, as you pay attention to your instructor. Some of you will have difficult issues to work through, but you will be less likely to have them, and fewer of them, if you relax and enjoy the experience rather than "waiting for something to go wrong." You instructor and dive masters are there to help if it does. It probably won't. So the night before your first open water dives, relax, watch a movie, look at underwater pcitures or videos, or read a travel magazine about a destination you are headed to. Be positive in your outlook and you experience is likely to be positivie too!
DivemasterDennis