Disclaimer: I am not an expert in anything.
In no particular order…
1 – Measure twice, cut once.
2 – Your best is never going to be enough for some people. Don’t worry, they are simply not your people.
3 – You will find your people, be patient.
4 – Own your decisions. You made them for a reason, good or bad. They are your responsibility.
5 – Sometimes, it just is what it is.