I haven't rtft but I'm English and have lived in Ireland for 15 years.
I would say the leaving is much more stressful than a levels. I think it's the fact it's the same exam for everyone in the whole country, having to do subjects you don't like and the points system. But it's better to have a broader mix of subjects I think and also transition year is great - they should bring that in in England so teenagers get to experience lots of different things and hopefully have a better idea of what they want to do.
There is less choice of non traditional courses here, less apprenticeships, distance learning, btecs and more rigid trading for professions such as teaching eg no in school training.
I think people driving on their provisional license is dying out.
Funerals are very different. Not better or worse, I think it's just what you are used to. I find Irish funerals and visiting graves too much, like there's too much emphasis on death and not enough privacy, it's a bit overwhelming for me. But my dh finds English funerals too cold I think. It's definitely a cultural difference. The time delay is not cultural though, it's usually because of a back log in the crem in the uk. English people would usually prefer a shorter gap I think.
I live in Dublin (north) and there's very little difference in schools, it is competitive to get into, baptism barrier is a problem for many, or having visitors (only one visitor allowed to maternity hospitals half the time because of winter vomiting bug - I think having more than one person at the birth is unusual, in Dublin anyway, no one has their mum - only their dp) or going to soft play (there are lots of parks and soft play etc and everyone goes).
Also families are still larger here, I have three kids and am expecting, very odd in England but I'm happy it's very normal in Ireland. People can be very judgmental of larger families in England.
I would also agree with people who said less blended families here and slower moving relationships.
GP waiting times much less here due to having to pay.
Bar people are much quicker and able to do more than one order at the same time in Ireland.
Communions are a big difference, unless you're catholic in England you don't have them as they're not part of Church of England.
I came from a small town in England and now live in Dublin, so there was more everyone knowing everyone's business etc for me in England!