You have to understand, since he grew up without arms, his feet were like his hands already. It's not as difficult for him as you make it out to be.
Yes I'm sure it definitely has its challenges, but if one of us with hands tried to do it, it would be amazingly difficult. Since he grew up with his feet AS his hands, it wasn't near as hard for him.
It's not like he just picked that up in a year or two- it takes a lot longer than that.

