I used to have really high end paint sprayers, two spray hose gas powered units and all. When they finally died I bought one from harbor freight for like $65 new. Works equally as well as the spendy ones, cheaper than renting. The hose isnt real long, so you got to move it a couple times to get around the whole house, but it weighs like 8 pounds literally. Buy one of those, then clean it up really well and you will have it for all your future projects. I painted my entire exterior for less than $300. And its large and split stories. Buy a couple drop clothes, a pair of good brushes and rollers one 9" and one 4" roller frame and skins. All in for less than $150 you can have good reusable tools buy decent paint for coverage and laugh all the way to the bank saving money on diy. Cheap paint takes multiple coats to cover, which means more material needed and the time of doing it over and over. Spend the $10 more a gallon and save time and money in the long run.
