There is always a fear in thee back of everyone's head,i just tend to push mine too the far backk,i had thee same problem,but i tried anyway,i didn't get all my arm muscles to go through and my elbows gave out,i tipped my toes and Face planted,Painful,but i got up and continued training...(after a few minutes of rest) x]
I am finnaly Very proud of my kongs x] i rarely face-plant ^^