My teacher told to me:

2) Find a way to record yourself.

Lots of my students have balked at this one. “I get nervous!” “It will sound bad!” etc. To me, those are reasons to record yourself. Unless you are able to play through long passages by memory, chances are good that you are too occupied with the actual task of making notes to be much of an observer. Quality of tone, rhythmic integrity (which doesn’t magically happen without a metronome), little idiosyncrasies and major technical blunders are much easier to observe after the fact. Have courage. Record yourself and take stock. Doing so regularly will keep you from ignoring things that other people can hear and will force you to do perhaps the hardest thing of all: recognize improvement.