I have done a ton of successful side projects, one of them even turned into a great and growing business for me.

As a former musician the concept of jamming seemed like a great way to think about side projects.

In other words in my experience the best you can do is not even think about your side projects as projects (as the require process) but rather as jam-sessions.

Hopefully you have hundreds of little ideas to explore not just one (if you have that one big idea you should probably turn it into a real business, quick your job and maybe get funding)

The worst thing you can do is to worry about process (buy domain name, spend time on logo etc)