Its not impossible to commute from Galway, but not easy. Rosters can involve 6 days on, with some long days. Some early duties start at 4am, and some late duties finishing after 2am. Rest time between duties can be 12 hours, so I wouldnt advise commuting. Some crew do, after a few years, but they normally end up going part-time as it is tough.
The recruitment page, mentions that the vacancies are for a panel, so I'd be curious to see when they will train crew.
I would highly recommend people to apply. Its a very unique job, fantastic experience, and you get to work with a great group of people