reach up with your left hand and grab the bars, put your right foot in the left corner or middle of the tray. step and push down with your foot while throttling, and get the ski to hook up(suck in water so the back end sinks. Then throttle it out of the hole straight or while steering right to lift you up. I like to lean back a lot and exit straight, rather than try to take off with the ski sideways.
Maybe someone has a video that would make it easier to see the motions.