Before trying this you should be really good at Ollie to Manuals and Half-Cabs. Come up to your target and pop a Half-Cab, Getting on top shouldn't be much of a problem. When you are in the air have your weight on your back foot so you are ready to land on a manual. A very big tip is to try to stop spinning in the air once you are done or to slow down because once you land on a manual and you don't do that you will keep spinning and fall. OK now you can get onto the manual, manual across your target, it shouldn’t be too hard and then just put your weight over top of the middle of the board and ride away clean.