Do exactly that, SLOW it down. Be Patient.
Avoid the first 30-45 minutes. Don't touch anything that makes you feel uneasy. Don't touch anything that has a risk beyond your risk tolerance. Ensure your risk and reward targets are realistic.
You should have multiple reasons for getting in a trade, the sum of which produce a high probability trade. You should be familiar with the type of trade you are entering.
Don't get caught in the market's emotion. You will force yourself into trades, or limp in to crappy setups if the market sweeps you off your feet.
Treat each trade like a hypothesis. Know why you are entering, and how it can be proven wrong. The market will present and help you build a case, it is your job to understand the factors that strengthen your hypothesis or weaken in.
If mediocre crap works, who cares. The stock market is FULL of opportunity. If you miss a move, more will present. The longer you wait, the more information you have.
More often than not, the better trade is to not trade.