One thing at a time.

Your task list should remember everything else for you. So forget about everything else, focus on the task at hand. Set a time when it is due and try to finish it by then. Deadlines are another way to structure your mind and force it to march.

Ideally, all you should care about is the task in hand (and ofcourse make sure everything else is on the task list). Once you achieve this, time will take care of itself. Everything else will take care of itself. Its all about focus! Structured focus! :)