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rat20v , Do it your selth .
easy steps . if the car isnt used daily or do it the night before
Unplug the glow plugs and spray some Oven cleaner on the were the threads Screw in to the head . and leave for a while for it to bite in , , next morning give it another dose , the oven cleaner bites in to all the grime and crap * WARNING* it is costic *SP* so if you get it on your hands get it washed off as soon as poss ,
and if you are doing it , just becarefull when doing it , as if you go steady on it , you will be able to feel if its gonna snap , the garage will just go " hes signed the paper , so what if they snap"
Access to plug 1-2 are a little harder to get at , 3-4 are so easy to do if you have small hands like me its easy to do
i got plug 2-3-4 done on my bro`s M jet basicly the same engine and i got them done with in 20 mins