If a person has a reasonable source of income and is willing to invest, then he should never delay investing. It is best to start investing first. You can do everything after investing. If you want to learn everything beforehand, then it will be too late to invest, it will never be the right decision. You have to start investing first and then you can learn a lot.
I don't think an investor needs a reasonable source of income to start investing in bitcoin, what an investor needs in other to start investing consistently is a discretionary funds, because their are so many folks out there that are earning quite a lot of money or a reasonable source of income as you claim that still can't invest in bitcoin because they they can't sorts out their discretionary funds, so in my own opinion, what a newbies investor needs in other to start investing in bitcoin is discretionary funds and the basic knowledge on Bitcoin and how to go about your Bitcoin investment.
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It would be good to have discretionary funds and you will get benefits by investing. Even if the market is in a recession, disappointment will not be able to touch you. If you invest with the money you have freedom, then investing becomes very easy and affordable. For example, discretionary funds. And if you have knowledge about Bitcoin, then you will not have to worry about your invested money that much. An investor does not need a reasonable income to invest, if he has a strong desire to invest, then he can invest step by step through the DCA strategy.
And the DCA strategy will make investing easy and will also help in creating discretionary funds.