There is no need to create an emergency fund before investing. Because if you are not investing, then in my opinion, an emergency fund is of little importance. Invest first and then gradually build an emergency fund. Or if you have the money to create an emergency fund, then immediately create it as soon as you invest. Try to keep 3 times your disposable income in an emergency fund.
I personally think that whether you invest or not you need to have an emergency fund. Because at any moment you may fall into danger, you will need money to face the danger. It's not that only those investing in Bitcoin should have an emergency fund, everyone should have an emergency fund. Now it can be said that those who invest in risky sectors like Bitcoin, in this case emergency fund should be given more importance, you must have emergency fund. Now if you invest in Bitcoin, if you don't have an emergency fund, it will be difficult to hold the investment for long.
One of the reasons why it is emphasized that a Bitcoin investor should have emergency funds, is not just for the mere fact that everybody should have emergency funds, is basically because hence your faced with a little short coming or challenges, instead of dipping your hands into your investment it is rather you beckon to your emergency funds.
We know that there are individuals that just have a emergency funds they just kept, sometimes as their savings, they are not under any pressure or investment obligation, so their psychology and way of thinking is totally different from that of an investor. An investor must make sure he strikes a balance with his discretionary income, his emergency funds and his investment funds at all times.
Wether you are a peasant, middle class or the rich, you have no reason why you shouldn't invest in Bitcoin if you have a source of income, because all you just need is to be financially smart, by knowing how to manage your money very well once your paycheck comes in that's all, because knowing how to arrange your budget is what going to determine how far you can go in your accumulation, because it's through that your source of income you invest and even build your emergency funds, so that you wouldn't have to temper with your holdings if a serious financial emergency situation arise in the future.
Their are some set's of people that would complain that their income is not huge enough to invest in Bitcoin, but they still go out to drink and even gamble, that why I am certain that once an individual have the will to invest, he will always do it if he has a source of income, no excuse, but anyone that doesn't want to do it, will always have a reason why it's not the best time to invest.