Here's what I do: Start by calculating your own bandwidth(a.k.a. the amount of stuff you can do) over a day, a week, a month. It's not as easy as it sounds and

Here's what I do: Start by calculating your own bandwidth(a.k.a. the amount of stuff you can do) over a day, a week, a month. It's not as easy as it sounds and many people have no idea how much can they actually do. Push yourself for fixed amounts of time and measure how much you can output for various tasks you're interested in. If you're anything like me you'll feel very underwhelmed. "How the hell did I do so little? I thought I can do more." or something along these lines. This is good, means you've found your (current) limits. You can use that to do estimations. When you want to go into something that will take way too much time (and you should know that somewhat beforehand) either cut it off or start thinking about how you can outsource. Keep in mind you can improve on any of these, but having a back-of-the-napkin guide always helps me with priorities.