Absolutely do this and absolutely do it yourself. It's not difficult at all. No one will care as much how it's done than you... the true benefit is the ease of future cleaning.
Wash the car on a Friday night. Paint correct Saturday morning. Then apply coating - I'd suggest Optimum Gloss Coat - then let it cure overnight.
I've used the optimum, cquartz uk and cquartz gliss and can strongly say the Optimum was higher gloss and easier to apply. Gliss was the most finicky.
Also I'm a novice and I made mistakes each time but they were easy to correct. I would caution against doing a coating on the windows - that's a giant pain in the ass. I did wheels with the gyeon coating but didn't come away very impressed. No coating will make wheels all that much easier to clean.
Plenty of YouTube vids on doing this.
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