If you cannot adjust the backrest, use a small pillow or rolled-up towel to support your lower back. Your forearms should be parallel to the floor when your hands are placed in the center of a computer keyboard. Lighting Lighting affects comfort and performance. It should be directed toward the side or behind your line of vision, not in front of or above it. Bright light can bounce off surfaces.
Northern light is considered best for both office and computer operations.
If you have a computer monitor, it should be positioned at a right angle to the window. No noise can be as stressful as too much noise. Preserve your professional image. Judgements, fair or unfair, may be based on background noises. Try to keep callers from hearing televisions, vacuum cleaners, loud music, etc.