I am buying a house (first one) and the inspector took a picture of about 18 inches of flexible duct work in the attic which is missing its insulation. Our go-to repair guys (I work at a real estate office) looked at the picture and gave me a bid for $1800 to repair it. That seems outrageous to me. My question is, how difficult would it be for me to crawl up there and repair it myself? I assume that I can get to it since the inspector could. Thanks.