KiloBravo,
Many of us who grub about outside on the airfield started as security guards or similar, as a way of getting in to the airport and made our way from there. Certainly that's where we recruit from. We do all our own training (6 week theoretical course, exam, then 2-6 months shadowing before being let loose on your own), but then we're a large airport operator so we've got the resources. We also offer places on some of our short modules for people form smaller airports. People who already have the City & Guilds Aviation Studies and optionally the City & Guilds Ops & Flight Despatch are at a distinct advantage during our recruitment. You might also look out for the Edexcel Btec in Aviation Studies. There might be colleges that still offer the City & Guilds by distance learning. I found all these an excellent grounding for the CPL exams as well. As a PPL you might find you already know lots of the basics, but the Btec will give an insight into larger aircraft ops. I'm afraid I don't know if any of this is available in Ireland - try searching for these courses on the net. 'Distance learning' seems to be a modern way of saying correspondence course.
Anyhow, best of luck. Those of us who work on the airfield tend to find it's a pretty good life (pushing snow about at 0300 occasionally notwithstanding!!!)
The Odd One