Mamas who pump....

How in the world do you make a pumping schedule and stick to it??? And how do you get ahead to where you're not feeding your LO what you just got done pumping?? I'm trying to pump every 3 hours but every time the 3 hour mark hits I'm doing something with the baby and I end up not being able to pump. I don't see how y'all do it honestly. It's so frustrating.