Actually, a steady income is a MUST for saving a part of your salary in Bitcoin, especially if you employ a DCA sort of strategy. Because it doesn't matter what you call "prepared", if you don't have a steady income then you definitely ARE NOT ready.
U are right , before going into Bitcoin investment it is important one have a source of income , I have recognized the importance of steady income with my own investment journey , it is also good for long term investment success, when their is a stable financial income either with your job or other investment you can manage risk and it enable one be consistent in their investment.