I have hired a handy man to replace windows in my house. I have a feeling that he mis represented himself and his experience as he does not seem to really know what he's doing. Three of the windows are in and the patio door is tomorrow.

My biggest concern is our big front window. It has been ordered and will arrive in afew weeks. My concern is that this window will not have the nailing flanges that the stock ones did. Could someone out there fill me in on the proper way to install a replacement window with no flanges? It is 96x48, picture window in the center and a single hung on each side. We ordered it without flanges because the installer has been trashing my siding putting the other stock ones in and this one can just slide into the opening.

Thanks in advance for any help!