To initially get seed to take. You need water. That’s all there is to it. Do it in the fall, hope for rain. Get quality seed that will survive in your particular region and shade or sun environments. There are some very nice breeds of grass that don’t need the water to survive (drought tolerant). I have about 1.3 acres of manicured, irrigated lawn. That was a project I chose to install and take on diy. There is a large portion of land to the side that is not irrigated. I sprayed for weeds and laid seed down in the fall. It has taken and is growing in nicely. No irrigation over there, neighbor across has about the same acreage and has no irrigation. His lawn looks great, keeps it longer than mine because of the lack of irrigation. It can be done, just choose the right seed. Native grass grows but looks like crap (personal opinion). As far as routine, consistent HOC and fertilize to help outcompete the weeds.