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Bitcoin DCA is open for everyone, as long as you are willing to invest at least 10$ in bitcoin every week there is good profit waiting for you, if you planning to invest for longer period. Here are result of investing 10$ a week for 10 years and 5 years. 
https://dcacryptocalculator.com/bitcoin
"If you are born poor it’s not your mistake but if you die poor it’s your mistake." Whoever said this is very much true. As we are discussing on this thread, there are ways to improve your financial conditions for investing little amount in bitcoin for longer duration. Those who have enough cash can surely earn big here but there is room for those who have little cash with them.
It's all about educating yourself that bitcoin is a secure investment. I am saying Bitcoin is secure investment not just because I have Bitcoins but based on historical data. Those who want to improve there financial conditions and are not investing in Bitcoin are doing unjust with them.
For you as person to think about investment, you should possess the spirit of patience in you, for business or investment to flourish obstacles must occur at this time, you keep holding I know that it may seem impossible at the beginning but I know that we can scale through if really want to suffer and earn better in future.
My advice for any potential investor is that whatever you have, go in with it, don't delay further because any delay can be seen as a missed or lost opportunity and this can be regretted forever.
That's very good point. Delaying your investment plan wont give you anything. A thousand mile journey start with a single step, so is bitcoin investment. The first step will be difficult and its about convincing yourself to invest in Bitcoin. We have discussed so many scenarios here that show results of investing in bitcoin. Bitcoin do takes time but it gives guaranteed return more then any Bank can offer. My advice for any potential investor is that whatever you have, go in with it, don't delay further because any delay can be seen as a missed or lost opportunity and this can be regretted forever.
Making your amount smaller does not cause the return to become more guaranteed.
Your chances for a good or a bad return are the same whether your invest a small amount into bitcoin or a large amount.
On the other hand, your chances of not feeling the negative effects such as getting emotional about your BTC investment and about losing money are reduced if you reduce the amount you invest and also if you invest over a longer period of time.. like you mentioned, you could end up investing a lot more into bitcoin than what you would have had invested if you were to have had to decide to lump sum into it.. .,.
On the other hand (am I running out of hands yet) if you end up being too wimpy in your BTC investment, you could regret that you did not invest more or to invest in a quicker kind of way (maybe front-loading your investment).
In the end, there is a balance between how aggressive you feel that you can be without causing other possible problems of overdoing it in terms of either emotional and/or financial risk due to improper planning.
Even if you invest various lump sums into bitcoin, you can smooth out your lump sum investment with DCA, yet there still can be a lot of differences between people in terms of whether they ever get access to lump sum funds and also how they might identify and then treat such lump sum funds if they choose to allocate them towards bitcoin investing.
Some one who does not build up and/or manage their emergency fund very well might not know how to identify or to manage lump sum funds, either. Lump sum might not be as common as having abilities to manage smaller amounts of cashflow as the cashflow comes in, but lump sum does come up from time to time, and can sometimes be applicable and very powerful for those folks who have figured out how to identify categories of their money and to figure out how much emergency fund that they need and to be able to recognize/appreciate the amount of extra funds that they could use towards bitcoin investing.
Just the ability to accurately identify how much money is excessive (and can be treated as a bitcoin investment amount) beyond the emergency funds is something that can develop and improve with practice.