Whenever you leave your home, you should assume that it will be shown during your absence, even if there aren’t any showings scheduled yet. Therefore, prior to leaving your home, ensure that the lights are on and that the drapes and blinds are open
If you cannot be absent, be inconspicuous. Do not follow prospective buyers around. Be invisible unless you are asked a question. If asked, be pleasant and friendly, but do not divulge any information which may come back to haunt you during negotiations;