My advice is to ensure you have a Trading Plan Trade Sheet.
I used to be nervous too especially trading smaller time frames. These move very quickly and the minute you enter a trade, there is a possibility to lose very quickly. This creates a lot of unnecessary tension and nerves. This is one of the many reasons I and others switched to the larger time frames and Swing Trading.
Nevertheless, whatever time frame you use…get a Trade Sheet that has rules and checklists to justify each trade. I found that whenever I traded without this, I would be unsure if I had taken everything into account before clicking that button. This uncertainty creates anxiety and fear.
If you have Trade Sheet that you know will provide you with a good trade 80-90% of the time, you will be more confident. It gives you a visual confirmation that you are making the right decision and that everything has been accounted for.
This is what I use.
This guides me through all steps involved in the trade - from analysis to closing of the trading platform as well as while the trade is in motion.
If you use something like this during Demo Account phase and the results are good, then just use it on the Live Account and the nerves will fade away and be replaced by celebration of trading wins.