Hoop Head
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I don't think you need a professional install depending on your level of being willing to learn and play with settings. There's a lot of good resources, usually PJ specific that you can follow along with.
As for vs a TV, this isn't a simple question to answer. There's a lot of variables at play. First, you need the right room for a projector. You really want something that's light controlled. A great room set-up is not going to look good. The more light control you can do the better. Some of the newer types of screens help with that though. So for a bright open room, TV all the way.
If you can get light controlled though, the better projectors aren't beating OLED but they'll match or beat everything else. Plus you can go much larger. There's nothing TV wise over 100", at least for mortals. So it really comes down to size vs OLED level blacks. My projector after the latest firmware and settings tweaks are close enough to OLED that I'll take the larger size for the completely immersive experience.
BTW, one thing that goes for both is getting it calibrated correctly. That's something you can either pay someone to do that has the equipment or get it close by using some precanned settings and adjust with test patterns and the like.
The calibration was my main thinking with professional installation. I was blown away when I got my first tv professionally calibrated and made me wish I did it sooner. I'm fairly tech savvy but as I grow older and tech gets newer I don't have the patience to bridge the gap.
Being a native Phoenician I loath the sun and have blackout curtains all around my house. I may go projection next time I need to replace my TV. I'm happy with what I have now but I get that itch each Prime Day when new stuff rolls out. That's usually when I decide to upgrade, not necessarily what's on sale but it causes me to dive deeper into the tech each year.