I say when you're starting, do as much as you would like to do. If you feel yourself gravitating towards one project more. Then focus on that more (meaning, be able to drop a project that doesn't interest you any more. Don't feel obligated to follow through with it.)

At the beginning I feel it's more important to figure out what you like and what's working more for you. (Kinda like dating.)

However once you figure that out. It's time to buckle down and go for the win. It's much harder to execute than to talk about. But I'm sure you can do it.