Don't focus on trying to get all of the little wins. Don't go for the low hanging fruit just because you can knock it out the fastest. Go for the most important task that will move you towards your most important goal. Constant progress, even if only a little, is critical to maintaining focus and momentum towards the goal. The small tasks should be seen as the cherries on top, the dessert to be had after the main course. You don't want to get full on dessert and junk food before you eat the entree. Emails and ad-hoc tasks never stop coming in. If you constantly focus on the quick wins you'll never have time to work on your top priority.