Sure I fix my own flats... in fact I was just verifying the status of the glue tubes in all my bike kits just yesterday... one was dried out and I replaced it... all the others were OK.

I fix my own flats as there is no AAA for cyclists, bike shops are never around when I get a flat, and frankly I'd just as soon get on my way.

I can fix a flat in under 10 minutes easily, and over the years I have developed a habit... I carry a spare tube and a flat kit and pump. I pull out the flat tube, patch it and put into my kit as the spare. I put the spare from my kit into the tire and fill it (after inspecting the tire for glass, sharps, etc... ). This method gives the patch and glue plenty of time to "vulcanize." This method has never failed me, and at times I may have a tube that has 3-4 or more patches before I retire it. I retire tubes for age or failed valves.

I also carry a small roll of duct tape (duck tape) to use as a tire patch in the event of a bad tire cut. A couple layers inside the tire will work quite well and last a couple hundred miles. I simply roll the tape around part of my pump and leave it there to carry it. Handy too in case a rack or fender or something works loose.

I've done this for well over 30 years and never had a problem with this habit. I've passed it on to my son. He should never have to walk, if he gets a flat.