Actually, when investing in bitcoin, you have to consider many things, and some of the things to consider include your income and your personal needs because these two things can affect your bitcoin investment easily. Because if your income is low and you are trying to squeeze yourself just to invest without taking care of your own personal needs, an emergency can come that you will end up using breaking your bitcoin investment to solve, and in this case you might sell those investments in lost.
If you are investing in bitcoin, then make sure you have emergency funds. Don’t invest everything you have in bitcoin, in case there is an emergency, that’s what you're going to fall back on. But if all your investment is in bitcoin, whenever you are in need of money, you will have to sell some of it, even if you have it in mind to hold for the long term, and you might even be selling at loss.
If you don’t have enough income yet and you know if you try to invest, it’s really going to affect you, then just forget about investment for that time and make sure you focus on other important things in life. Whenever you are balanced, then investment can set in.
When you are going for short term hodling, do you still need this emergency money because we need to make newbies to understand why this emergency money is very important to BTC hodlers, but for short term hodling, I don't think this emergency money is important to them because they are hodling the BTC in a short period of time before they can sell to make money. Even though you invest all your money on BTC and have emergency money that can make you to exercise patience till the bull run occur before you can sell, which is the best season many people use to sell to accumulate profits from BTC investment, but as a newbies, don't invest all your money in BTC because you need to have the experience like the old investors before you can take such risk in the future.
You can invest in BTC, whenever you have the money and you will be happy to hodl BTC because if you miss this season bear run base on, you don't have the money to buy BTC, you can prepare yourself against next bear season which is what make many people to value BTC hodling than other cryptocurrencies.