best advice right here. Master the grab in a straight air and then while on flat ground pretend to set your spin a reach for the grab.
I used to love toxic tail grabs, so before i dropped in i would slow motion set my spin and look right for the grab. then i did the same thing in the air.
I learned to spin with safety grabs first, because it seemed easiest. plus it gets you used to the feeling of reaching for a grab and holding it