Q: I now live in Ireland and the billing info will not let me change country. My credit card is Irish

Hello, maireadfromdublin.  

Thank you for visiting Apple Support Communities.  

I understand that you are unable to change the billing information for your Apple ID.  Just to verify, you are attempting to change the country first and then updating your billing address?  

Change your iTunes Store country or region

If you are attempting to update your information via the steps above and are unsuccessful, take a look at the troubleshooting article below.  

If you can’t change your iTunes Store country or region

Cheers