Read the latest Air Accident Investigation Branch reports about blocked pitot systems on Big Jets. Very revealing. They also have other recent reports where they highlight lack of recency as a causal factor. Everyone from magazine articles to CHIRP to GASCo to the new CAA Safety Dissemination outfit are going on about lack of recency.
You can do worse than follow John Farley's checklist.
I think the time to pack up isn't when you feel apprehensive about taking flight, but when you can no longer be bothered. A friend and flying buddy of mine describes it as 'you gotta have the love' and I think he's right.
The other evening, I'd finished a day's flying in the Club aircraft and sitting outside was the C150 I share with him. So, I put the Club aircraft away, did the debrief and the paperwork, then went back to do 30 mins in it. Ah, bliss!
TOO