We want to replace our existing sliding glass door. We have the door but are not quite sure what to do. The problem is that we have a concrete porch that was poured right up against the house. It is so close that they ran a bead of caulk between the house and the concrete porch. The concrete sits just below the frame of the door. Since it is winter, we don't want to start until we are sure what we will have to do to get it in there. We have cedar plank siding and we have to cut away some of the siding to get the old door out. The porch is covered and the roof line is close to the top of the door. Any suggestions on how we can get the old door out and the new one in without having to break up some of the concrete? We really are not too worried about the roof for the porch. That can be remedied. How do we get the bottom fin of the new door in when we can't cut away the siding? Not to mention get the old one out!