If your house will soon be invaded by contractors, take time to prepare for the onslaught. Readying your house and family for an upcoming renovation ensures safety and security while work is in progress. Coping with a contractor requires patience and understanding, but good advance planning reduces the upheaval. First get a set of blueprints to mark up. Then meet with the contractor and ask him to explain the sequence of construction. For your family’s sanity, you may have to …