Ask HN: How to do Project Management for personal projects?

I want to work on an idea and want to build an web application on the same idea

All I am bad at is breaking down the tasks into iterations and tasks and track them down with progress.

I have always seem people on HN doing awesome personal projects with their jobs.

I would like to know how do you divide the tasks, turn them into iterations and if at all you use any project management tools to track them

Please pour in your ideas and educate me

Thank you all in advance