>>217161
Start small and work up to bigger/harder ones. You could try something like this: Bunnyhops > small jumps > bigger, trickable jumps > one hander > no hander

You could also see if there are any bmx/mtb parks that have a foam pit, resi-ramp, airbag, or wood-chip jump so you can try things without as much risk. Practicing things like flips on a trampoline can help with getting used to moving in the air as well.