registration is free , easy and welcomed !!!
I have heard people say you can basically breathe through it and out your nose.
Like playing with your drink as a kid with a straw. Remember drawing the drink up almost to your mouth then letting it drop back down. Also practice by trying to make as quiet a sound (yelp or cluck) as you can with it, almost no air. Then incorporate that kid with a straw technique and build from there.
All the greats breathe through their eyelids. I have been doing it this way for 30 years.. hope someday I can call in and kill a Gobbler with a trumpet.