It is impossible to determine the risk of infection "by eye", but it is worth considering if: 1. the master was without gloves; 2. The machine and clip cord were without barrier protection; 3. The foreman used a steel holder, but he had not heard about the autoclave. Everything is very, very bad if the machine was assembled from a motor, a handle and a string, the paint was used in an intricate composition like a burnt, and the master was drunk while working as a graduate.
If the master observed all the rules of hygiene (so to speak), beat with a sterile needle, on a clean surface, etc. - the risk is the same as in the salon (practically zero), because most of the diseases that we have in childhood frightened (AIDS, hepatitis, for example) can be obtained through a needle only if a patient used the same needle a couple of minutes in front of you. In the air, these viruses "live" for a very short time.
If you are still worried, go to the Polyclinic and get tested