We should also understand that Bitcoin investment is very different from trading and so in Bitcoin investment you don't need to know everything before investing as that may not even be possible to gather all the necessary knowledge or know everything about Bitcoin investment before venturing into it. At a start all one need is just to know how to split your income into various section or parts and then know how to accumulate or buy your Bitcoin from your discretionary Income, using a wallet that best suit you and also ensure to keep your seed phrase safe and every other thing will be learn later as the person progresses.
Bitcoin investment should not be delayed at all. To start investing, make sure that you have a prudent source of income and have the basic knowledge to make prudent investments. For purchases, make sure that you can buy Bitcoin using an exchange and choose a trusted wallet and store your Bitcoin there.
This kind of basic knowledge will be enough to start investing in Bitcoin. To sustain investment in the long term, you must have a deep knowledge of financial management, risk management and investment management. However, you should not delay investing for this, rather you can practice this while the investment is ongoing and gain deep knowledge to make yourself a skilled investor.