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I would add that it may may feel very natural to mouth breathe underwater, with or without a mask. If you have done a lot of surface snorkeling. You're still breathing basically underwater because that's where your face is. Take the snorkel out (or leave it in) and swim down maybe 10 feet to the bottom. Up again, blast it clear and continue to "breathe underwater". They even made this part of the PADI OW course--I imagine quite a few decades after I started doing this as a kid. I know it's hard to snorkel in northern waters without exposure suit, except for a fairly short time in summer. But maybe do a lot in the pool. Anyone who can do basic snorkeling probably doesn't find it at all unnatural to breathe through a regulator at depth--just way lest restrictive as to depth, etc.