What is the safest way to replace a newly-cemented zirconia veneers? It is too yellow and has a mother-of-pearl sheen (Photos)

Hi. I got veneers for my two central incisors and two lateral incisors. 2 days before the installation, she texted me that she changed emax to zirconia for free because she wanted me to be less anxious. She assured me zirconia is stronger However, the color is very yellow. Note: I did not undergo any teeth whitening prior to having veneers. We agreed to replace the veneers. We are whitening my canines now. I am concern about removing my zirconia veneers...what is the safest way to remove them?