How do you approach big decisions?

I’ve been auditing biology classes, and my plan was to sign up for real courses in July. Now, I’ve found a second job. I work twenty hours each for both my jobs. I’m noticing that I can’t do much more – I have quite a few other (as in, unpaid) responsibilities, and my body has been telling me I need to slow down. I know forty hours doesn’t sound like it’s horribly much, but right now, my days are extremely hectic. Adding university is just unrealistic.

I’m faced with the decision of giving up one of my jobs, or my study plans, or arranging things so I can somehow fit in all three areas. My old job is fulfilling. It’s not a perfect fit for me, it doesn’t come easily – but it gives me a sense of purpose, and I need that. My new job is fun. It suits me very well, and it challenges me. I need that, too.

I don’t love work all the time. If I’m totally honest, my inclination right at this second would be to drop the old job – but I know with absolute certainty that this is likely to change within the next couple of weeks. I know this because it always does.

So…how do I make this decision? How would you?

PS: This is in General, I’d be very grateful if we could try to keep it on topic.Thanks, jellies.