Remove the seat -
Remove the bolt at the rear of the seat - place your fingers under the metal tab to prevent scratching the fender - hit the hump of the seat towards the rear of the bike.
Remove the gas tank -
Have a pair of pliers ready.
The 3 bolts on the speedometer cluster, remove the bolt at 6 o'clock - lift up the rear of the speedometer and push it forward - remove the speedometer cable (unscrew the cable with the pliers) - unplug the wire connector.
Turn the petcock to off and remove the fuel line.
Remove the bolt at the rear of the gas tank - slightly lift the back of the tank and pull the tank backwards.
All new spark plugs come pre-gapped.
If the engine is well maintained, the spark plugs can last forever.
They're cheap enough....change them every other oil change.