It's not too bad a job...first you need to remove the intake manifold which is detailed on steps 1-4 of LightMan's excellent write-up:
http://www.peachparts.com/Wikka/OM606962GlowPlug
Note, that steps 5 & 6 are optional for this process but recommended to do while the intake is off.
Then you'll need to perform this procedure (it is for a different model but the same replacement process so just ignore the initial steps which are to gain access to the injector pump...you will have already done that by following steps 1-4, above):
http://www.peachparts.com/Wikka/OM602InjPumpFuelLeak