It's good to hear that you are planning a trip to Ireland.
You are right that new measures will come into effect on Friday, December 3rd. While Ireland remains open for non-essential travel, all arrivals aged 12 and over who are fully vaccinated or recovered from COVID-19 must provide either of the following:
- A negative or not detected antigen test (taken within 48 hours before arrival)
- A negative or not detected RT-PCR test (taken within 72 hours before arrival)
The test result must be certified and not self-administered. If you are not fully vaccinated or recovered, you must show a negative or not detected RT-PCR test taken within 72 hours before your arrival.
This is subject to change so I would advise you to keep an eye on the Irish government's website
I hope this information is helpful.