make a handle pass trainer. ITs super easy, it was a Kyle Schimdt devise back in the day.
Take a gallon milk jug and fill it with sand.
tie a 24 inch bungie to the Milk in a loop.
Connect a wakeboard handle to the bungie.
get plenty of room and practice spinning the contraption around you, effectively your handle passing. the faster you spinn the more resistance the bungie will provide. Once you've gotten real comfortable spinning the handle around you, start actively moving your body in the opposite direction further increasing the speed of the pass. This will help you big time with muscle memory and get you more comfortable and confident in passing the handle.