To stay focused while trading, try and manage to make shorter watch lists, because the bigger ones will just lead you to confusion, nothing else. Make use of less technical indicators, for they only fill up your mind with abundant information, proving less beneficial in the long run.
Also, be who you are. Choose a trading style that you think suits you best, only then will you be able to focus while trading. Do not get carried away by what others think or do. Stock markets are filled with distractions. Maintain a distance from them and focus on your plans only.