If you plan to refurbish a major shop tool or other equipment, take some photos before you start. They possibly can save you some head-scratching during the reassembly process. Take pictures from a number of angles, and take close-ups of areas where you think you might have some questions later. The more complex the machine, the more photos you should take.
If you plan to replace your floor covering and throw out the old rug you may decide to leave it down as long as it doesn’t make it impossible to paint the floor trim. In most cases you will want to use drop cloths and tape them down over the floor covering using removable masking tape.