The only hard part about the swing aerial is the loss of height due to the lack of blocked momentum (if done from standing). To fix that, try to enter the swing aerial with a small hop and that will give you way more height. You enter it in a similar way, as you would enter a swing webster (axe webster). Try to swing your backleg from the front all they way to the back and up. The higher you’re able to swing that leg up, the less distance it has to travel to land again. Being more flexible will help in this regard. Spot the ground throughout the whole trick and drive that landing foot right into that spot.