I heard Stevie had that issue very bad but every time I have seen him play it does not look that bad. The guy who told me about Stevie shaking could have been exaggerating though.
I saw him play at the SBX couple years back and told my friend "look, he's nervous" but he never missed. Later on I found out he got bit by a dog and had nerve damage or something and it's more of alike a tick than anything. Doesn't effect his game at all. Also heard he was a beast road player at one point. Looks like a real nice guy too. Every pro likes him
Nick Varner is another that is shaky but can't beat the guy for fundamental good pool. His play style and Buddy Hall are two of the players that I always though beginners should watch to learn the right way to play as far as stroke and how to play the balls.