Don't you think it will be to be a low coiner than been a NO coiner? From your unstable income you can still figure out if you have discretionary income to start up with your investment you can be buying little fraction of it, if you also cheek and see you don't have any discretionary income to accumulate Bitcoin you can lock up till when you have realize that you now have a discretionary income to get started then you start, you might miss buying opportunity while waiting to get a steady income, you don't necessarily need steady income but you have to have discretionary to kick off your investment.
I understand where you're coming from, but you must know that to get started with your Bitcoin accumulation, there are certain things that should be a must have, and having a discretionary income is one of those, an investor should discover whether he has a discretionary income from his income before he starts his accumulation and not after, so if you're yet to discover your discretionary income or your original financial situation, I'd suggest you take a moment to reassess your financial situation and be sure that you've actually got a discretionary income and then you can get started. I try not to see reasons why one may not get started with their Bitcoin accumulation, but there are certain situations that may as well require a NO coiner to stop first and take the necessary measures first before getting started because the results might turn out to be far worse than one who had not started.