I nquire as to how many students are going to be in the class. All classes must include hands-on training with live models. If there is more than one student per trainer for hands-on work, you will not get the individual attention you need to learn these procedures effectively. Four procedures on live models should be the absolute minimum offered. Ask to see their portfolio.
Some people feel they can train on all levels after only two or three years in the industry.
This is just not so. T alk to someone else who has taken training from them. Look for certificates. Any good instructor should be attending continuing education courses at least once a year. This industry is advancing so rapidly that if a trainer is not keeping current, they are not someone who can teach you the latest advances and techniques.