I went from using a twisty to pedals.
The most important thing is learning right. You're going to have to relearn anyways, but make sure you get it right.
Default scaling sucked for me. I couldn't get any fine-tuned aim corrections and it was just like a twisty stick (i.e. no better than one).
So my most important advice is: Play around with the scaling NOW, while your mind and reflexes are fresh and new. If you leave this until later you will only suffer, as you will have to re-learn things then. You're re-learning already, use it to your advantage.
Find the right scaling that allows you the control you want in 3 areas:
1) aiming
2) coordinated turns, "stepping on the ball"
3) full deflection for spins and use as air brakes.