He kept asking for the check-in instructions, which we send 24 hours, before the check-in time. 

Instructors are a wealth of knowledge and you can propel yourself forward when armed with the right education. 

That's in company with your instructors with whom you will likely have personal contact.

There's usually a clause like this:EFFECT OF ADDENDUM: THIS ADDENDUM AMENDS AND SUPPLEMENTS THE CONTRACT AND, IF APPLICABLE, ESCROW INSTRUCTIONS.

Simple electronics with simple instructions are key, for example.  

@Kyle GrimmDay job...Two fold: I provide private music instruction; primarily drum students with a couple of guitar students.  

I received multiple messages instructing me not to tell anyone it’s an Airbnb, restricted pool usage hours, had to pickup the key from a completely different location which made the check in more difficult (lock boxes apparently weren’t allowed on property- nor the ability to use electronic locks) and the experience overall wasn’t that great (even though the unit itself was nice).As an Airbnb owner myself I always struggle when I want to leave someone less than a 5 star review but my wife wants me to leave a 2 star.

I don't do it, I wouldn't recommend it, but I'm sure you could find some good instruction material on how to do it by connecting with people here.  

There's a warning in that, too, about this sort of cruelty: "The villainy you teach me I will execute--and it shall go hard but I will better the instruction."

So, even if you don’t want a degree, I would say participate in some class or learning program that requires you to do more than just receive information from an instructor.