You don't have to get in or out of a position all at once. Avoid the temptation of wanting to be completely right.

The ability to change one's mind is probably a key characteristic of the successful investor. Dogmatic and rigid personalities rarely, if ever, succeed in the markets. The markets are a dynamic process, and sustained investment success requires the ability to modify and even change strategies as markets evolve.

Being wrong is acceptable, but staying wrong is totally unacceptable.

Good traders liquidate when they are wrong, great traders reverse when they are wrong

Traders focus almost entirely on where to enter a trade. In reality, the entry size is often more important than the entry price

If you don’t stay with your winners, you are not going to be able to pay for the losers.

Being a successful investor & winning in the stock market is a matter of skill & discipline and not luck alone