Remove all furniture, hardware, light switch covers, and nails from the wall. Spackle where necessary by pulling a scraper over any holes. Scrape until all excess spackle is removed and sand down if necessary.
Paint thin even coats, starting at the ceiling and working your way down. Ventilate the space and allow the first coat to dry overnight before starting the second. Pay special attention to corners and seams of the room to make sure you have full coverage.
Choose a flooring. I went with Ikea Tundra click-together floor since this is a tiny room and we are renters. Do a few practice rounds to get the feel of the boards, then lay them down in a staggered brick formation. Our room is so tiny we didn't need to do this, but we suggest it to prevent buckling.
Custom measure and mark your boards for the size they will need to be. Cut the remaining boards to fit your room using a saw and wearing proper eye protection. Sand the edges with fine grain sand paper.
To attach the trim, you will need a power drill and panel nails. Drill a pilot hole using a bit that is slightly smaller than your panel nail. Hammer the nail in through the trim and wall at a 45-degree angle.