Be consistence with your plan. Plan your trade and trade your plan. After opening your position (setting TP and SL in your trade), you should avoid to watch your monitor. Let the market running naturally.
As some posters above me have pointed out, there is no reason to say day trading doesn't work. Sure, if you are a newbie, don't go quitting your job and becoming a full-time trader, it requires experience and it's not for everyone. But there is nothing inherently wrong with day trading.
I've read a ton of lists that contain beginner tips and gotta say I like the ones you picked. Think you mentioned some of the most important points and I don't see these mentioned nearly as often as they should be. For example, trading on you own instead of following someone else.
There are so many things that beginning traders have to stay away from like high leverage, day trading, and high risks. You must first learn by staying low key in the market. The beginning is meant to gain experience because you have plenty of time to make profits. And the focus of gaining experience is to become consistent at making profits.