I take it your having problems when you are doing the mask clearing? (have to remove the mask completely, breath, then replace mask and clear)
I originally had a few shocking moments when I first flooded my mask and had to clear it, however with practice I learnt to control what I was breathing through.
as a nose breather I'd often keep the back of my tongue sorta up against the roof of my mouth which isn't useful in the slightest let me tell you.
Another thing you can do which I found useful (and this is out of the water) when your sitting around with nothing to do, open your mouth, keep your tongue down, relax your throat, jaw, neck and breath, breath in and out hopefully through both your nose and mouth and take the time to work out how it feels, we are so used to breathing that we don't take much notice of it anymore, so just let your self breath.
Then let your self focus on breathing in and out through your mouth, it'll feel different, I found really heavy breathing worked for me at first so I could feel the muscles that contract to stop air passing through your nose working (it's a slight pressure change)
anyway, I'm babbling, it's waaaaaaaaaay to early to be useful heh