Learn from your mistake- Use it to step forward and don't stack to it.
I would say learn from others mistakes and that saves time and loss, for example a new trader can learn how to avoid panic selling by looking at others and how they suffered.
Focus on your mistakes- If you're worried about your mistakes,what will you do to avoid it?Focus on what you've done and you'll be taking a productive action.
If you know your mistakes in advance why would you even make them? So mistakes can only be worked upon after you have committed them and so I don't think there is a realistic way of avoiding mistakes unless you see someone else do it or you yourself do it.
The points you mentioned confuse me a little but I have a simple answer for the thread's title
"How to Overcome and Handle Your Mistakes in Trading?" I have a 3 step solution for that
1- Don't make the same mistake again, someone who does the same action and expects different outcome is anything but not a trader.
2- Avoid copying others and distance yourself from copy trading.
3- Implement what you learnt yesterday and do this vigorously until you make a habit of it.