Have a comprehensive trading journal. Record every trade and analyze every mistake - as well as every success, so you can learn from both. The more you know, the less anxiety you will feel.
In my opinion, a beginner should start with a demo, and then invest a small amount in a cent or micro account and trade with those money to get used to trading on a live account, rather than for profit.
Personally, I think scalping should be for more experienced traders, actually. It requires an excellent understanding of technical analysis and quick reflexes to get out of a position on time. It's not nearly as easy as it looks.