Stop fucking procrastinating and get some post-its or index cards and make a task list.

OmniFocus? Google Tasks? JIRA? What the fuck are you thinking? Technology gets in the way of managing projects. You know what works? Fucking paper and pens. Get some post-its and a flat surface. Divide the surface into 3 columns: "To do", "In progress", and "Done". One thing in the "In progress" column at a time. Write your task titles so they start with a verb. Now get on with it.

Really really can't make do with one thing at a time? Have different rows for different projects. But be very suspicious of multitasking; it's bad for productivity.