Interesting no-one has mentioned roller nap or or paint type fit for it's intended application. You would do well to learn about them both and utilise them appropriately. Long naps can be messy with some paints if not applied carefully but have an important role to play in some areas; short naps better suited in others. Ceiling paint is very different from wall paint, very different indeed. Don't be afraid to use a small roller and tray in smaller areas.
The walls and ceiling will take no time; it's the timberwork where your time will be spent unless you're spraying, which you won't be.
Read RJM's post again and take heed.