We built a pool. Never owned one. It's easier than you think. I would try to DIY then call in help if it's too much. Ours is small, 15,000 gallons.
In the summer it's once a week chlorine tab refill, a cap and half of Perfect Weekly, and a few cups of acid. I shock it every other week or so.
Most around Katy advertise $180-220/ month. My yearly spend on chemicals is about $600.
Cody
Fightin Texas Aggie c/o 04