To answer you question: A LOT. A TON.
I blame the ice A LOT. It's ALWAYS the ice's fault. It's too hard, too soft, too brittle, too wet, someone put a big rut in it, there's a hole right where I wanted to do my loop... it goes on and on.
The problem is- when you compete or test, you don't know what kind of ice you are going to get. So even if it is the ice's fault, you have to learn to deal with it.
I spin best on beautiful clear ice- a rut can ruin a good spin, but perfer to jump on more messed up ice...I don't like to jump when skating fast, and you skate faster on good ice.
If the ice is very bad- I will not even try 8-step mohawk. That is my limit. My coach understands. He doesn't really want to take me to the hospital, and I'm so uncomfortable with the move, it isn't worth adding another bad element to the equation.