How to become a ceremonial (weddings/funerals/naming) celebrant in Ireland

Would anyone have information on career change into becoming a celebrant. I can see various courses or affiliated website, which seems to be more of a recruitment to train rather than an application to train/certify. Do you need a certificate to conduct this type of ceremony? I understand a registrar needs to be working for the HSE in BCM office and they conduct weddings on week days only. Clergy in the church can obviously do weddings on weekends in a church! I would love some further information as I research into this career change.