Hi - we just bought a new house and really like the color inside. The problem is the staging of the house included a LOT of wall hangings so when we move in there will be nail holes everywhere. Also- the paint they used is flat paint and we would like to use eggshell for a little more durability. The color is a light tan/gray. Is there a way to spackle over the nail holes and then do one coat of the same color paint but in an eggshell finish rather than flat without it showing every spackled area?