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TheRedHead:You're less impaired than the AOW student.
Not to diminish the dangers of 300 feet, of course.
DiverBizz:True comment...CHECK YOUR GUAGES OFTEN...and relax.
mhedstrom:Thanks for the tips everyone. It's definitely a low level of anxiety - and I'll keep an eye on how I feel beforehand, and if it doesn't feel right, I just won't do it. The instructor at the LDS is very very good (well, we think so at least), so I trust him.
ScubaTexan:You just gave yourself the best answer of them all -- if it doesn't feel right, DON'T DO IT! Don't ever be ashamed to abort a dive, even before you hit the water. The bottom line is for you to be comfortable with the dive -- before, during and after.
mhedstrom:Thanks for the tips everyone. It's definitely a low level of anxiety - and I'll keep an eye on how I feel beforehand, and if it doesn't feel right, I just won't do it. The instructor at the LDS is very very good (well, we think so at least), so I trust him.
MikeFerrara:The way narcosis "feels" is the least of our worries but to answer your question, assuming O2 to be narcotic, just a bit shy of 70 ft.