You are right. If a person has the right knowledge, the right knowledge of the strategy inside him, then he will never be afraid of the market going up and down. Since he has the ability to analyze the market completely, he can analyze it correctly with his maximum knowledge and invest correctly for a short time or a long time. Although he loses some amount of his money, he has the right knowledge and ideas to recover his money. So I think for a professional investor, no matter what the market is like, he will not be afraid of being in the market, but he can continue to invest with his own knowledge.
You don't have to be a professional to invest in Bitcoin. If you have a regular source of discretionary income and know very little, then Bitcoin is enough to start. People's knowledge and experience can vary depending on their strategy, some of them invest weekly or monthly. Excessive analysis may be detrimental to your investment, as you may want to buy Bitcoin when its price dips, but it will lead you to delayed investment and your success will never come in your favorite time. You need to practice regularly and continue to save Bitcoin regularly through patience.
People just need to understand how Bitcoin investment works and they are good to go on Bitcoin.
They don't need to have deep knowledge about it since somehow they would just learn lot of things from the experience they get. Since Investing on Bitcoin for long term doesn't need any huge effort since what investor should do is to buy Bitcoin then hold it on their wallet.
Their accumulation would became more better if they apply DCA strategy since if they can make everything work according to what they plan to happen for sure that everything will be alright on their investment.