Really easy Tom, i replaced my Creed eyes last week , i claim zero tech skills,but just be careful,and patient and all will be good, have a look in the Vanguard section on here i think,and there are loads of Youtube vids which detail what you will need to remove to get to them ,just make sure you unplug the battery and eyes before you remove the grip frame from the main body if you have to,as thats what i did , good luck,Dennis .