Hey Brouhahaha,
I worked in Bord Gais.
Basically, B.G. distribution usually enter the ground downwards, street-side of your driveway ok. Then they use a 'flexable drill' to go horizontally to the point on your external wall that you arranged to have your meter.
The process is as simple as that, however !
Expect possible negatives such as the crew being slow at the work and job completion at times, keep an eye on it yourself and think about your meter placement too. Better have it outside so the reader can access it without bothering you, etc. But contact them to and simply query it, see that they can tunnel like that, because sometimes they do a survey to see that the underground path they want to take isn't obstructed by anything.
Thus there is the possibility that a trench lay may be required.
Good luck and call the distribution department as they will be the ones who will arrange everything ok.
Lao.