CapitanBlack
Contributor
Best way to get over a fear is knowledge. These are the things that go through my head when I get that twinge of fear.
When was the last time any of us heard about a diver being eaten, or maimed by any creature in the PNW? (my answer to myself: Never)
What exactly is down there? (my answer to myself: More of the same thing I see here).
Basically, there isn't anything scarey 'out there', all the scarey is 'in there' (your head). I feel that being calm and aware helps too. When I feel the fear/panic coming on, I stop and give it a think. Usually my body will give me the "what the hell is out there fear" which my mind becomes aware of and answers "Not much different than what I see now".
It's primarily a fear of the unknown, so make it "known" with knowledge!
my $0.02
+1
Before 2004 I was diving only in tropical seas, where viz is usually very good all year round. Then I switched to fresh water lake diving in Europe and first dives were very scary and thrilling. Cold, dark water - viz sometimes around 3 ft. During a one of first "dark water" descents, I had a panic attack with the real "tunnel vision" effect (about a minute or two, I've only seen computer's screen and nothing around). Somehow I've managed myself to calm down and continue the dive. Then I rethought my fears and I started doing mental exercises, very similar to what Bighiller described above...
I've tried to completely relax underwater and start teaching myself getting a pleasure from bad visibility and harsh environment. It maybe sounds bit as a sadomasochism , but it works well. I get more fun from complex and "scary" dives. But it does not mean at all, that I'm looking for troubles... Moreover, I do my best to avoid any potential problem underwater, through careful planning, good judgement and in-water skills improvement.