Try snorkeling first, this will get you used to breathing through your mouth. Trust me...once your under water, breathing through your mouth come real fast.The only issue I would need to get over is a very odd habit, I breathe mostly threw my nose which tends to me an issue when normally a personal only exhales. I am sure this could be fixed on my end but it would take time and I am not sure how that would look needing lessons before learning.
It's true. I have never scuba dived but snorkelled. My first time I thought it was hard. But it was actually fun. I'd love to get some scuba lessons once I get better with snorkelling.Try snorkeling first, this will get you used to breathing through your mouth. Trust me...once your under water, breathing through your mouth come real fast.