Pick the instructor that suits you best and stick with him/her or change school. While I am sure everybody goes through a difficult patch, every lesson shouldnt be a trial. I was going to give up but following a post on here I am now enjoying it and I look at it that I am paying for the experience and am not overly concerned if I dont get it right each time - my instructor will teach me at the pace he thinks I can cope with. Learning Air law on the other hand is like trying to eat cardboard
Good luck and dont get disheartened.