Why think about investing if the finance is still unstable this will be a problem in the middle of the road and until whenever your investment will not run smoothly, but it is true that when they have earned additional income or a sufficient monthly salary then they can set aside to invest in bitcoin.
Actually one thing you should know about Bitcoin investment is that if you should wait till you get the amount of money you want in your bank account before investing you could end up not investing at all because the more you are waiting to get rich first that's actually the more expenses are compounding, although I no that you have your own decision to make but waiting to be completely financially stable could possibly take you a very long time before you can start accumulating Bitcoin.
You don't have to get huge amount of money before you can start investing on Bitcoin, however is not like everyone who are into Bitcoin now have a bank stored with huge amount of money but instead they started from somewhere and before they realize they had already gotten a good amount of Bitcoin on their portfolio, so I would advised you start from little through the use of DCA strategy and with time and consistency you could be surprised with how far you will go on your investment.