I will add that a I trail brake as part of my entry to every curve. I may hardly use the brake at all but, my goal is for the technique to be practiced and routine and, if I am a bit hot, for it to NOT be a sudden, grabby, panic move. I already have a finger on the front brake, squeezing just a bit, I've already compressed the front suspension a touch. From there, it's the same as every other control input; smooth as possible.
It will absolutely help smooth out your turning, be it a bad line you need to correct, rough road, what have you, as well as potentially save your ass if you are too hot and it will absolutely put you and your ride on the deck, instantly, if you screw it up.