Only takes about 30 mins to take everything off, change the plugs and put it all back together again.
I did mine recently. Pretty easy really.
Disconnect the BOV from the return hose, losen off the hose clamps and take off the intake pipe that goes over the top, from memory you have to take off a couple of other hoses as well but it is nothing tricky, just remember where it came from and put it back there after.
Then you have a few bolts to get the black panel out. Under that you have the coil packs, they should be on brackets in groups of three. Disconnect the cables going to them and pull the, out, be careful with then as I have heard that they are fragile.
and hey presto there's your plugs!!
Give the intake pipe and the rocker covers a quick clean and polish while you have it all in pieces, only takes a few minutes.