I'm thinking of cancelling my facial appointment just to be a nuisance.
Don't you want the appointment? Why would you cancel it?
I'm a very demanding customer and I want them to know I'm in charge.
If you really can't make it to your planned appointment, it's okay to cancel if you give them sufficient notice, but it's rude to do so at the last minute or without good reason. You also shouldn't deliberately cause problems for service providers, because they are just trying to do their jobs.
I'm just doing it because I want to.
Cancelling the appointment just because you want to is not a good enough reason. Businesses make plans based around the appointments they have booked. You need to stick to the appointment you made and show up unless you have a valid reason not to.