Be emotionless: Two biggest emotions in trading: greed and fear. Do not let greed and fear regulate your trade. Trading is a machinelike operation and it's not for the emotional ones. If you sit next to a productive trader and keep an eye on him or her, you may not be able to tell whether he or she is producing or losing revenue. That's how emotionally stable a prosperous trader is.
Don't trade based on leads from other people: Trade only when you've finished your own research. Be an aware trader.
Maintain a trading diary: When you purchase a marketplace instrument, write down the causes why you buy, and your intuitive feeling* at that time. You behave the same when you sell. Dissect and put down the errors you have made, likewise the things that you have done right. By consulting to your trading journal, you learn from your previous errors. Improve on your errors, keep on acquiring and keep rising.