My husband left our household in January, and I am faced with many home repairs. As I am now on a very limited budget I am trying to tackle as many of them myself as I can. Almost every window screen in my home has a hole or rip in it; I think most are too big to try and patch. Could someone explain to me, in layman's terms, what I need to do to replace them? I am (fairly!) handy. And the windows are vinyl replacement windows. Please help! or we will have flies in here to beat the band, come summer!