When painting, place a thin layer of a moisturizer on any skin exposed that may get splattered with paint. It will be easier to remove the paint from your skin. Warm colors are reds, yellows and oranges. They tend to grab the eye and fill space. They are soothing and warm.
Cool colors are blues, greens and violets.
They tend to give the illusion of open space. When using a patterned wallpaper, if the room is small use a small pattern. If the room is large, you can use a large pattern. Decide on a focal point and decorate around it. Your focal point could be a piece of furniture, a fireplace, ect.