I think it sort of depends how much of your own wrenching you hope to do after the course. If you're just hoping to learn some basics, e.g., derailleur adjustments and changing a flat, then I think you could figure it out on your own with a decent book and some Youtube videos. If you hope to do more, then it might be worth it. My DH's response to your question--and he's essentially a self-taught wrench--that he'd rather spend that money on tools. His take is that if you're already mechanically inclined, you can pick up a lot of it on your own.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher