I want to mention that I've always found it helpful to have a good relationship with mechanics at a bike store. I've often asked and paid them to double check my work, and t letting them know that I want to learn to do stuff on my own so I'm better prepared when touring.

and yes, touring is a lovely calming activity, and knowing your bike mechanically is a real bonus, and knowing it's in great shape generally means a lot less chance of mechanical problems on a trip.