ive been boarding for less than 1 year and can grab just about any grab hs ans ts and it all really depends on which grab ur gonna do to determine how much height u should get. the easiest grab for me in indy (toeside grab, rear hand, between feet) i really dont need much air to pull it off but if its your first time i would suggest cutting out about half way as u can, make a progressive edge towards the wake, realease off the top of the wake and bring both your knees to your chest and grab indy. its really not that hard. after u got indy grab down, i would work your way to a tindy, tail, lein, nose, roatbeef, method and so on. use the same teqnique u used to grab the board. one very important thing, DONT BEND OVER TO GRAB! always bring your knees to your chest. theres a list of grabs for you (sorry, i only got goofy footed). Good luck!