This is the most blunt, real, and effective advice that can be given.
It is very important to emphasize that daydreaming of doing everything (and all at once), is a dopamine trap! No matter how long one mentally masturbates on a beautiful idea, it’s only through charting a course, breaking the problem down, and going through the motions and the steps to completion, humbly and dutifully, that will yield any results.
Another commenter, unfortunately downvoted, also said something important:
> Never tell others what you gonna do unles you have done it.
This is equally important advice, as it falls in the dopamine trap category.
Namely, refrain from satisfying the creative urge merely by talking about it. Instead, act first, and talk about the results.
Goes without saying, but let’s say it anyway: of course this doesn’t mean that you should hide like a mad scientist; communication is crucial in creation. Just don’t spend all your time talking about all the nice things you’d have done, if you weren’t spending your time just talking about them while leaving them undone.
Also, if the thing you want to make has some sort of personal meaning or cause, that’s a great impetus.
And don’t forget to fail, and don’t be afraid to fail, either. Try, err, try again, err elsewhere, keep moving, keep learning, keep making.
It’s good fun!