I'm fairly handy and have replaced window screens a number of times but I usually end out with a small wrinkle or a small rough edge but who cares as it is not really obvious. But a sliding patio door is another matter. It is has a huge span and is very visible to everyone so I decided to seek professional help. Spoke to a couple of manufacturers and they wanted around $150 plus I had to remove the screen door myself and then drive it to their facility, leave it there and retrieve it a few days later and reinstall the door myself. Not to mention I would have to find screening and the right size of bead to hold the screen in place as my current bead had grown very hard and brittle over the years. Found Doctor Screen on the Homestars site and contacted them via email. Got a return call very promptly and an appointment was made for a couple of days away when I could be home. John showed up on time, removed the sliding door took it out to his workshop trailer and returned with a flawless job and reinstalled the door all in about 20 minutes - amazing what one can do with the right skills, right materials and the right tools. John was polite, business like and very neat and tidy. What more can one ask for.