Try try try there is a sweet spot when it comes to manuals. I'm currently learning nose manuals and they are a bit harder but my bed advice is to stand on the board like you would when you Ollie and keep your weight even on the board. If the board goes one way add the slightest weight to the other side. Idk man it just takes practice and you'll eventually get the muscle memory down \m/

Try to find a position where you can stay that helps you keep your balance where you aren't waving your arms around like crazy