To do or not to do. There is no question.
Not to do is the same as doing nothing. You are doing, but that doing is choosing to do nothing.
Whether you choose to do or to not do, both have a high chance of failing. The choice is whether the world happens to you or you happen to the world around you.
Do in small doses instead of trying to build Rome in a day. Do, do, do. When in doubt, choose action in short, testable doses and improve on that while you work.