I am insecure about my mechanical skills, so I'm often excited to work on fixing something broken around the house or on a vehicle. Well, my hot water went out Monday or Tuesday and four attempts to relight the pilot light were for naught. A couple websites suggested that the thermocouple is often quick to break and try replacing it first. So I went to Lowes and bought the only one they had, which was only $8. It was so easy, unscrew the old one, pull it out of where the pilot flame goes, put the new one in the pilot flame, and then screw it in, and relight it. It lit up the first time.
Looking into the furnace with the new copper thermocouple. The pilot light was lit, but didn't show up in the picture, interesting.