They actually make tools specifically for the car, but most times you can just buy a cheap boot puller at many stores or online.
Twist them left and right, while applying steady pressure.
A person can replace the rear spark plugs very easily. Disconnect the battery, remove the cables/boots and the old spark plugs. Put in the new spark plugs, reconnect the cables and boots, and reconnect the battery.
Disconnect the battery, remove the spark plugs wires and boots and remove the spark plugs. Put in the spark plugs, replace the spark plug wires and boots, and connect the battery.
Disconnect the battery, remove the spark plug cables and the boots and remove the spark plugs. Put in the new spark plugs, replace the cables and boots, and then connect the battery.
Disconnect the battery, remove the spark plug cables and boots, and remove the old spark plugs. Put in the new spark plugs, attach the boots and cables, and connect the battery.
Disconnect the battery, remove the cover, remove the cables and boots, and remove the spark plugs. Put in the new spark plugs, replace the cables and boots, replace the cover and connect the battery.
Disconnect the battery, remove the engine cover, remove the spark plugs wires and boots, and remove the spark plugs. Put in the new spark plugs, replace the spark plug wires and boots, replace the engine cover, and connect the battery.
Disconnect the car battery cable, remove the spark plug cables, remove the spark plug boots, and remove the old spark plugs. Next, put in the new spark plugs, replace the boots and cables and reconnect the battery cables.
Disconnect the battery, remove the boots and wires, and remove the old spark plugs. Put in the new spark plugs, reattach the boots and wires, and connect the battery.
Disconnect the battery, remove the spark plug cables and boots, and remove the old spark plugs. Next, put in the new spark plugs, replace the cables and boots, and reconnect the battery.
Disconnect the battery, remove the spark plug wires and boots, and remove the old spark plugs. Toss out the old spark plugs, put in the new spark plugs, replace the spark plug wires and boots, and connect the battery.
Disconnect the battery, remove the spark plug cables and boots, and remove the old spark plugs. Dispose of the old spark plugs, put in the new spark plugs, attach the spark plug cables and boots, and connect the battery.
Disconnect the battery, remove the spark plug cables and boots, and remove the old spark plugs. Put in the new spark plugs, attach the boots and cables, and connect the battery.