Your really don't need a dedicated darkroom to process your film or prints. You just need a room/space that you can make dark temporarily while you are doing certain activities. There is a difference. I have a spare kid's bedroom that I now call the den. A stupid name, I know. "The den of horrors". I blacked out the only window, and I have a felt covered board that I kick under the door. It serves as a temporarily "dark room", complete with enlarger and all the necessary toys. In the summer I'll process in the garage either in trays or by drum. In the winter if I need to process prints or film I process in the "den" with a drum and roller. I'll do all the fixing in the garage. You can process film and prints up to at least 20"x24" by hand in a drum of the proper dimensions. A roller unit is not a requirement. There's a million ways to attack the issue and everyone's situation is understandably different. Some folks have nothing more than a closet or bathroom. Alexander Gardner, Mathew Brady, Sam Cooley had horse drawn carts.