If you pour all your money into investing and are afraid of the ups and downs of Bitcoin, you will be in trouble.
Investing into Bitcoin with funds that are meant for your expenses or other necessities is a bad investment practice. It can further be described as being over aggressive in your investment and it can prove unsustainable for long, also it can lure the investor to tampering with his portfolio when the actual needs arise and sell at a time he didn't choose.
Bitcoin is best approached with discretionary income, in accurate cashflow management practice, you must first remove funds that are meant for your expenses before identifying that you've discretionary income and further splitting your discretionary income into funds for Bitcoin buying and others for building of backup funds.
Without a functional discretionary funds it'll be very difficult to sustain long term Bitcoin investment plan because you wouldn't have a proper budget for accumulation. Financial management is essential, if you cannot determine the actual percentage that'll be appropriate to use in buying Bitcoin you might over buy and it'll affect funds for your other needs. Investors that are on DCA method should be calculative and avoid anything that can make them to sell prematurely.
There's no need for aggressive buying when you don't have enough funds to cushion the effects of vacuum that it'll create in your discretionary funds. Buy with the amount that you can conveniently afford with consideration for your other needs that also requires funds from your discretionary purse.