To answer your question. Yes I would hire you as a personal trainer. If you're explaining how to do an exercise, I would just give you time to get over block. People are there to learn from you. It's just you and them, one on one. They'll be there with you throughout the block. If you feel like they're not understanding you, you could also just show them how the exercise is done and give pointers while performing the exercise. You have that option because you're job is very demonstrative.