There are many answers to this question however to begin this post today I'll say two things:
1) I don't do it all.
2) What I do manage to get done consistently begins the same way.
I get started.
It's not always easy to get started for an abundance of reasons. Many people don't like to get started because starting means you might do something and fail. Other people realize the great amount of work something significant will take and they dread it.
It comes down to ~ do you want to do something or not?
You can't do it all, but you can do something. So what are you going to do?
"All glory comes from daring to begin." ~ Eugene F. Ware