Back walkover/bridge kick-over HELP!!!!?
I'd say it's a necessary progression for back walk-over. Neither bridge-kickover nor back-walkover have any technical relevance to back-handspring though. They only increase your level of comfort in going backwards & aren't prerequisite skills for back-handspring. I would start with bridge-kickover before back-bend kick-over, even if you can do a back-bend. That makes it easier to work on good form in bridge which is critical. You need to be fully open through the shoulders and hips with your weight pushed back over your hands. Bridge with feet on a raised surface, bridge rocks, and bridge with hands by wall pushing shoulders to wall can help. Building shoulder strength with row &/or fly type exercises may be necessary. Don't work on kicking over until the bridge form is good. Learn to pirouette out of handstand so you have a get out if you kick up too far to drop back to bridge but not far enough to kick over. Then kick over from a feet raised bridge or step your foot up a wall.