With anything in life, if someone wants it bad enough they can over come most anything.
This reminds me of the kid in a wheel chair that rides at a skate park and is able to do back flips in his wheelchair.
And when I was racing motocross, there was a guy with only one arm that raced, and he wasn't slow either.
I feel like when you get in a mode where you tell yourself you can't do something, you can always embarrass yourself by remembering there are people like this that have a lot less to work with, but do it anyway.