[sighype]

Break the project up into lots of little pieces. Attack the little pieces. Don't do little pieces from other projects until the little projects in your main project on the way to a major milestone are done. As someone who had your problem for a long time: Trust me, it's this simple.

Try using some issue-tracking service to keep things organized to help you plan. JIRA may be overkill, but there are other systems that help.

[cmstoken]

I have a similar problem and this sounds like a great way to combat it. I'm curious, do you write down the little pieces as a todo list or do you just make a mental note and go about it?

[sighype]

Some of it is mental, but ultimately it does get recorded into a record-keeping system of some sort. It's too hard to always pull out the record-keeping system and keep things in it. However, when the record keeping system looks like it's running on empty, I tend to brain dump into it.

Just tell yourself to have a one-track mind and make your list and record keeping system your life. Never deviate, and just always do little steps always. Every big picture should always be made of thousands of little pictures.