Is it normal to have bad piano days?, there are days when I can play my pieces very well and my fingers fly and there are days when my hands don't respond very well and feel stiff and I don't play very well . Is this normal?
Sadly, yes.
depends how many. If you had 99 bad days, and 1 good day, then perhaps you're just a crappy pianist.
even writing out a check seems difficult.
People still do that?