^ having an end to just grind off of helps a ton, popping out back to regular is sort of a step beyond just doning the trick
the best word of advice I could give is to keep your shoulders parallel to the ledge no matter what, this makes pushing the grind easier, and you won't be inclined to go to fakie or just lazily fall out of the grind, and try to keep your heel from touching the ledge, as that will make you stick up every time