Risk is and should always be Priority
You might get an extremely high probability setup, that just looks too good.
You can size up and then boom you hit a SL.
That happens very often to traders, they size up and then suffer a big loss.
The name of the game is Risk Management.!
Sure, you might get a good setup, but that doesn't mean you have to overrisk.
Uncertainty is a FACT in trading, Never forget that!
Always think in terms of RISK first, and then your expectations.