I find that the best weapon against student frustration is success. Any success, even in the smallest thing, gives a degree of confidence and establishes a positive mental "template" for future activity. I have made it a rule for myself that every day, every student should leave the classroom having accomplished something. Towards that end, I make an initial student application as simple as possible, model it thoroughly, even run a rehearsal before the real thing. Once they have had initial success, however, later applications are provide progressively less help and require more original work.