I asked because I didn't want to throw out random, unrequested advice to a seasoned flat changer. So I'll start by saying that I have never changed a flat because I've never had one. I have all the supplies and have taken several (over the years) free clinics regarding flats. The best one was the most recent one and the instructor emphasized to theck both the inside of the tire once you have it off the wheel and the tube is out, and check the outside of the tire. Try to find what caused the flat, because if it's in there and you fix the tube, put it all back together, you'll just get another flat. So look and feel the inside of the tire for the culprit.
It's a good idea to check tire pressure prior to every ride. Is you have presto valves you lose about 3 pounds of pressure every day! Surprising, huh?
Let us know how it goes.