opticoat has a few different product levels as well.... the pro and pro plus can't be bought on amazon typically and are only available to the trained pros. The opticoat glass coating I think it's called can be bought and applied at home

 

I am all for turning over work to a pro, however if talking smaller problem areas like the Sils, wheels, or painted calipers - with guidance from videos - most competent DIY-ers should be able to handle it.

A pro would do paint correction and prep on a whole car and I'm sure they are worth the investment in their skill set.