Quote from powerfade:
Cocaine, there seem to be a lot of people on here who immediately assume your question means that you're a closet addict looking for a reason to hit up earlier in the day, or a failed trader looking for success in the wrong way.
However, optimal performance might include changing your body chemistry to best suite the task at hand. One problem I see in your plan is that the effects of alcohol are graded, so you will experience less of the effect over time and after effects will kick in. Do you then take another drink? Or do you only trade for 1.5 hours in the morning, or do you only feel that edge during the open?
You can take the edge off using other substances that will have less after effect than alcohol, IMO. I'm sure you could figure out which herbal remedies tend to lower blood pressure and produce tranquility (I note someone mentioned Valerian above).
In the end, though, the biggest question is this - do you get high? If you are someone who enjoys using drugs/alcohol for recreational purposes, I don't think it's a good idea.