Practice is practice. So doesn't really matter if you are shooting field point or broadheads. However, you should take time before the season to make sure your broadheads are shooting where your field points are. And then verify your pin settings at range as a secondary verification.
Some bow/arrow combinations you just can not get to tune so the field points and broadheads shoot the same. For instance, my wife shoots stiff for set-up arrows for hunting. Gives her much more penetration on elk size game than those weak shafts made for 50# bows shooting targets. So for her we can never get field points and broadheads exactly the same, but we can get the trajectory the same. For her, we just make a simple gang adjustment to her sight a week or so before the season and don't concern ourselves with where the field points impact from then until end of season.
Honestly, we rarely shoot our bows in that last week before season. And when we do, it's a couple cold shots just to prepare for making "That One Shot" count. For that we shoot broadheads.