The only way to manage your shakey legs, and unstable hands, which are infact not due to fear (at least not 100%) but the physical side effects of adrenaline, is to get in more fights. Your sense of hearing, perception of time, and a few other cool things happen when you have a nice increase in adrenaline flow. I've been in quite a few street fights at my old job, and the first few times I couldn't even remember what had happened, or how long it went on for. A year later, and about 50-60 more quality fights, I was able to mentally walk into the situation knowing I was going to dominate. My legs are still shakey after the fact, but never before.
Bodies will learn to deal with adrenaline in dfferent ways. If anyone is interested in the medical/physical aspect of an adrenaline rush and the adrenaline dump after the mental or physical stimulous is gone, I have quite a bit of information.
"We didn't pass freedom to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same, or one day we will be telling our children what it was once like in the United States where men were free."