While I am not an expert, I do have some experience in stock trading...my advice for what it is worth...
Have a limit - don't get too greedy or reckless
Have a plan (industry stock type) - trade in something that you know and understand...if you don't understand how the company works...stay out of it!
"Systems" are for suckers - just like at the casino, strip out emotion...it is not a game. There are a lot of other folks trying to do the same thing you are...except they have better and faster tools don't get too caught up in the momentum.
Although they should, markets do not always operate logically...the events of the last several months demonstrate this.
Invest for the long term...Warren B. is not worried about the next 6 months or even 5 years...he is playing on the 10 year plus time period...
Day trading is not for the faint of heart...good luck to you I hope that it all works out well for you...but just in case, I am certain that I would interested in your SDM if it comes to that...
Cheers,