وَالْأَوْلَى أَنْ يَتَوَلَّى الْإِنْسَانُ ذَبْحَهَا بِنَفْسِهِ إِنْ كَانَ يُحْسِنُ ذَلِكَ.
Translation: It is preferable for a person to perform the slaughter personally if competent to do it properly.
If capable is an important qualifier. The preference does not require an untrained person to attempt unsafe or improper slaughter.
A competent slaughterer can carry out the rite where the owner cannot.
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Bab al-Hady — Sacrificial Offerings, Eligibility, Slaughter and Handling
وَالْأَوْلَى أَنْ يَتَوَلَّى الْإِنْسَانُ ذَبْحَهَا بِنَفْسِهِ إِنْ كَانَ يُحْسِنُ ذَلِكَ.
Translation: It is preferable for a person to perform the slaughter personally if competent to do it properly.
If capable is an important qualifier. The preference does not require an untrained person to attempt unsafe or improper slaughter.
A competent slaughterer can carry out the rite where the owner cannot.