Brokoen bolt on engine mount

[lethal_xr8]

Hi guys I have an AU XR8 5spd and have boroken a bolt on the engine mount on the left hand has anyone got any tips on drilling it out and replacing it, i know the starter motor will have to come off because its the rear bolt but other than that any help would be great or would i be better getting a mechanic to do it? if so how much would i be looking at.

Any help apreciated, Cheers