I've gone the DIY route 3 times in the last year.
I bought this
CarPro CQuartz kit on Amazon for $85 or so. I liked it, it applied really easy. I clayed the car down then washed it, then did the kit. it was maybe a 4-5 hour process? I liked the results. Water ran right off and it had that wet look to it when clean. I cant really speak to the lasting power of it. Its supposed to last 18-24 month. Unfortunately I totaled the car after 6 months.
I almost bought the same kit for my new car, but I was being cheap at the time. I saw some great reviews for this
Chemical Guys product and figured I would give it a try. I don't think it gives the deep wet look, but its also a white truck I put it on, did my wife's SUV too. Water still beads up and runs right off it though. Been on about 6 months now, will definitely need to be applied again sometime soon. It will last a year tops.
Thats an expensive project to have a pro do it. Honestly, its not that hard to DIY. I'd recommend trying it yourself first. Its a satisfying job to do. It cleans up really easy now. I' do the "no rinse wash" now and its so easy to get it clean.