I use 25mg of metoprolol which is considered to be a tiny dose. 

I don't have a problem with shaking, but I do with concentration (are they watching me?  will I mess up?  Yikes, I don't remember how this is fingered.).

I've had zero side effects from the drug other than I start having a good time when I perform.  I take it and hour or so before with food.  That stretches out the effect.