To be perfectly honest. Having read your post, I get the impression you've not thought this out at all.
Is the inegrarted course very hard and does it demand a lot of work
Is a lot of work a problem?
What you're doing now is great, you're researching. But, I've got a strong feeling that at this stage you haven't got the slightest notion of what you're getting yourself into.
Cork is a good school from what I can see, but bare in mind they're going to be extremely busy with the Air Astana contracts.
You're probably hell bent on getting started, but if I was in your position, with the benefit of hindsight, I'd be building a separate career of some sort and apply for the cadetship schemes that the likes of B.A. and Aer Lingus has started running again.
From what I've heard, it's been much harder to get a direct entry position with Aer Lingus than get a cadetship. The point I'm making is that, if you can't get a cadetship, maybe you're just kicking the bucket down the road. While picking up a 100k debt.
In summary, plan for another career and try for any cadetships that become available. If you're itching to get flying, join a flying club and get a PPL. Doing the PPL with a flying club will also give you a better understanding of the industry.