I did alright in my confined class but when it came time to do open water cert became a different story. I am such a nose breather that I kinda freaked when it was time to do so. So my instructor had me to practice without my mask and just reg on the surface. After a few times it worked!!. I went back down that same day and did perfect. Just concentrate on your breathing and hang in there. I have all the faith you will suceed!! Good Luck!!