In my opinion, the phases that a surgeon should do personally are the incisions (which in almost all the best clinics are actually performed by him), but also the positioning, in my opinion, should be performed by the same surgeon, the other phases such as shaving or selection of the grafts (compulsory made with microscopes or magnifying glasses) can be delegated to the technicians. The extractions, if the doctor does it is better, if you find technicians who are not experts, you risk finding yourself with the donor area with non-uniform withdrawals.