[avaicavum]

Matthew,

IMHO this should be dealt with in the end of practice mokuso. I try to quickly 'accept' that it was a good practice or bad practice, and then 'let go' of whether it was a good practice or bad practice by recognizing that it really doesn't matter which.

Generally, I feel it is important to allow yourself to have bad days and accept them (but then learn from them). Otherwise, you will get into that rut of making each practice worse than the last because of the stress you are placing on yourself. Nothing ruins good kendo more than stress.