In fact, the disassembly process is very simple. Remove the screw in the red picture and you can pull out the nozzle. The nozzle is connected to the high-pressure oil pipe. It's off. You can pull out the nozzle with a little force. Note that the oil will also be sprayed a little.
If you change it, you'd better calibrate it with the identification code. If you don't mark it, it's no problem, and it has little impact on your work. The idling sound is a little different, and some are similar.