Did this some year ago on my 1130 caferacer. Not difficult. Remove the gastank and airbox. Tool from toolbox to loose gasline from tank. Think I use a long 3mm umbrako key to loose the clams between the airbox and the injector. The stock nozzle have a 1 hole spray patton (I think) the replacement have 4 hole.
My bike somtime stall when cold with stock nozzles. Never did that after the upgrade. It is also mutch smoother on low rpm now. The 4 hole nozzles gives a little less fuel(2-3% ithink) Soo if your bike goes a little lean you mybe must remap it.