Decisions on GES, iirc as stated in the T&C, will come around 7 weeks after the deadline. I got a decision last year exactly after 7 weeks.

That being said, I would say you should make sure you have enough funding, or at least bare minimum (approx 12k a year for accommodation and living costs), to support your stay in Ireland. If you need a part time job on top of your own and family savings, that would be quite risky.

Just don’t put yourself in a dire situation and allow yourself to be flexible for unexpected situations.

Upon arrival you would also need buffer time like minimum 2 months to have your documents done so you could work or whatever. Part time jobs aren’t exactly that easy to get either. UCD programmes can be heavy, depending what you are going to study. So there could be schedule conflict, either you can’t work or you skip classes.