I really agree with you man. A lot of people overthink it and end up doing nothing at all, waiting to know everything before they even buy their first BTC. But the truth is, you will never know everything. Even those that have been in the space for 5+ years are still learning every day. Bitcoin is deep, and it keeps evolving.
I personally believe that starting small is one of the best ways to actually learn. You feel more involved when you have something at stake, even if it is just $20 or $50 DCAing.
Knowing about Bitcoin is good but waiting to know everything before starting is a waste of knowledge, an investor ought to put that little knowledge they've got about Bitcoin to practice and learn more from their experience, learning is something that remains constant and the more you practicalise on what you've learnt the more perfect you get, in the case of Bitcoin investment, when you start, the more buy and keep hodling the more you get to understand what it's all about.
Also, everyone can't be on the same level financially, that's what some people don't understand, cause someone started with a $100 doesn't mean you must start with same amount whereas your discretionary doesn't permit you to, I guess that's another reason why some people keep waiting, Bitcoin investment is done according to one's discretionary and if yours can't allow you invest $100 weekly then starting with $20 or a little more is not a bad idea, it's better than waiting to get $100 before starting.
You literally described my situation when I started accumulating Bitcoin.
My friends talked a lot about Bitcoin and its importance, and I shared their views, but I did not have the opportunity to invest. But I believed that in the future such an opportunity would come, you just need to be ready for that moment, having gained experience. And then I invested the little I had, focused on developing habits and discipline.
Yes, someone will say that it is stupid to take such small amounts seriously, but this is actually investing in your good qualities. And everything worked like clockwork.
Then I had the opportunity to invest, and I was ready. Therefore, it is important to believe in yourself and be firm in your views.