You don't need any special tools to change spark plugs. When removing the wires grab the wire by the boot and pull off with a slight twisting motion. If the wires have been on for a while some of them can be stubborn to get off. As for tools needed get the proper size spark plug socket, extention, and ratchet and gap gauge. A universal is also handy to have. When replacing the spark plugs it is often easier to use a piece of rubber hose that the spark plug fits tightly into. Then insert the plug into the hole and turn in. remove hose and tighten with socket.