For me, I have had shaky hand problems for a long time. I try to put my hands in my pockets, but sometimes, you can't. Usually if I am sitting down, I will rest my hand on my lap. If I am standing up, I will probably interlock my hands behind my back so no one can see them.

One of the times (which was during my panic attack), I had to pack my instrument away (we just performed a piece I couldn't play without getting a panic attack) and my hands were shaking like crazy. I had to cover a plastic piece over the mouth piece. As I was doing that, I was shaking like crazy. I just wanted that to go by fast so no one would see I am having a panic attack. Then my friend notices my hands and asked if I am okay and stuff (she knows I get panic attacks because I told her and she's fine with it because she has panic disorder herself). I said ya, though I kinda wasn't.

Anyways, to avoid situations like that, I suggests holding onto something that will help prevent the shaking (like a table, your hand, your leg). This may help.

Sorry for the long story. Hope this helps .