Threw together some photos that might help first time tire changers do it themselves. I only took photos because I'm Kbps defective. LOL I was removing a stock tire and replacing it with a Chin-shin. Big ride Saturday so I'll also report how I liked or didn't like it.
First break the bead from the rim. To do this you can use a spoon with the edge pushing into the tire and pulling up forcing the tire edge off the locking area.
Then start to pull the first side over the rim.
Once the first side is off remove the tube.
With the tube out you can easily get the rest of the tire off.
Putting the new tire on is the exact opposite. Without the tube start the first side of the new tire on.
Once the first side is on slightly inflate the tube and put the stem into the rim. Use the nut to retain it in the hole but do not tighten.
Work the second side over the rim being carefull not to puncture, tear or rip the tube. Inflate the tube to seat the tire on the rim. Usually this results in a loud "pop" as each side seats on the rim.
reduce the preasure in the tube to proper levels and reinstall the tire on the bike.