Well let's see, first off they are electronic. Working these things under 20K+ psi isn't like a gas injector. They operate under high voltage. Then to change them you remove the valve cover, all the fuel lines, remove the tubes that fuel lines attach to, then remove all the rockers and the wiring harness. Then you can remove the injector hold downs and the injectors. Don't forget gaskets, seals and washers plus adjusting the valves when you put it back together.

On top of that if you don't know what you're doing you could potentially electrocute yourself or lose some fingers.

Yeah, it's just six little injectors.