Take it "pin by pin" - "day by day"  

The moment you stop enjoying them - its time to find another hobby. You are in a position many would envy. It should not overwhelm you. You should feel safe with the knowledge that you have 10 challenges ahead of you. There's just not enough hours in the day to be working on them. You need a system to keep your thoughts and priorities right.

Instead of working on them for the rest of the week - PLAY the working games.

It's not "work" - it's FUN !

Edit - if 10 pins leads to depression, then I'm a permanent resident of the pinball funny farm !