Plugs are a cinch, as is the coil pack. There are threads on here if you need them.
There really is no such thing as a transmission tune-up with a CVT. However, your fluid should be changed at 50-60,000 miles (the recommended interval in the owners manual is far too long). Tranny service on a CVT is more expensive than a conventional automatic so if your mechanic is honest that's probably where most of the cost is.
How many miles on your Patriot? I've had two CVTs and one failed at 110,000 -- I'd call that premature. My symptom was a humming bearing. It sounded for all the world like a conventional transmission failing (I've had those fail too, and at less mileage).
The second made it to 270,000 miles before it started slipping. There's no cure for that -- once the belt gets chewed up, its a goner.
Give this thread some time. There's a lot of folks on here more knowledgeable than I. I can only share my experience.
After further review . . . if your Patriot is a 2014, maybe you have a 6-speed automatic. In that case my post is all wrong.