I'm in NoVA and tint shops around here can fk'off. You can find good tint on ebay where I got 2 rolls of LLUMAR F1 Pinnacle nano ceramic for $40 each. I had a guy from Craigslist do it for $75 per window. Took him 2 hours and was flawless. 5% front and 50% rear
His day job? Installing the same brand tint at a tint shop that charged $400-$500 per window. He confirmed the quality of the tint as well. Also, if you're worried about getting ripped off by a hack, go to a tint shop and get a quote... then pull one of the guys working on another car to the side and ask if any of them do side hustle installs. That way you know the guy has experience.
I always get a local guy to do it on the side (5 cars in 12 years), and have never had an issue.