Just because you are done with your formal training, doesn't mean that you should stop learning.
As suggested here, practice the mask flooding, clearing and removal until you are completely comfortable with it.
The reason is that some day, someone may knock your mask off accidentally. Or a seal may pull it off (they love to see the reactions of divers!) Or a strap may break, or something unplanned may leave you maskless. When that happens (okay, IF that happens) you want to be able to not freak out. If you work it until it doesn't bother you at all, and you can deal with it easily, then if an "accident" occurs, you will be able to take it all in stride.
Just my unsolicited advice.
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NOTE: One thing that really disappointed me about my original instructor was that he allowed our class to do mask removal in a totally wimpy way. He was required by the certifying agency to have us each show that we could remove our mask, replace it, and clear it. He abided by the letter of the law, but not the spirit.
He allowed each student to hold the mask firmly in place, remove the strap from the back of the head at our leisure, get set, and when ready, pull the mask slightly away from the face, then replace it immediately. Then we could hold the mask in place, replace the strap to the back of the head, and clear it. The rest of the class loved him for making it so easy.
My buddy and I are jerks I guess. We felt that we really need to be prepared for "bad things" not just be able to pull a mask an inch out for a second. When it was our turn, we both, without prior consultation, each pulled our masks fully off, away from our faces, held out at arms length until the instructor signalled okay, then replaced and cleared our masks.
Were we showing off? Not really. We were proving to ourselves that we could handle the situation if a mask came completely off.
Do I have confidence that the rest of our class could handle the situation if a fin knocked their mask off? Not really. If in a controlled situation they were not comfortable doing a complete mask removal, then I am concerned. However, it is their life, not mine.
Sorry to digress,
Congratulations, you now have your learner's permit, now go out and DIVE!
Wristshot