It all comes down to experince pretty much. I have been trading stocks, futures, forex, bitcoin for almost 10 years.
Basically the best way is to look at the longer term charts and try and time trades off the short terms charts.
Basically in my opinion. Bitcoin is a long term bull, short term bear, and midterm a little bullish.
You can use TA to help you but keep in mind it maybe only works 20% of the time. The rest are fundamentals.
Much alike to anything there is no secret answer as to 'how to trade'. It is as you said a case of putting in the time and effort to learn and become more experienced in what you are doing. By asking questions or reading books or following courses you will only ever reach one level, until you actually dip your toes in to market you will never be able to progress beyond a certain level. I think with time there comes something almost aligned to a traders intuition whereby you can predict the market without even really being able to fully understand in your conscious mind why you are so sure something will happen. This is just your subconscious mind processing all of the years of experience you have.