I don't lose my speech holding my arms up, nor do I have trouble separating my arms at all. They might get shaky after being held up for a while, yes, and I would not be able to do that. I would probably have to lie down if I held them up for long. It doesn't matter if I hold up one arm or two, both are hard, but I guess two might be harder because it bears more weight on your back, neck, etc. I don't know about the tremor thing. I get it when I am really really weak. It's like a weak and shaky kind of thing. It isn't there all the time. It applies to everything though, not just my arms. It happens to my legs, my hands, my fingers, my head as well. It's universal.