Stable income is the reason for the DCA strategy. The use of discretionary income makes it easier for you to scarcely think of your investments. Bitcoin investment is not a total get rich fast program. It's more of a way of investing your excesses to curtail unnecessary spendings. When you have invested the right way, you seem not to think about it and however allows you to invest for long.
You can only do so if you have the needed knowledge to proceed further - without it, your hands will become shaky, and your investment may be lost due to fear - to avoid such a fate, one should get the needed details to behave properly with his investment.