This is the right place to master your skills. Why to wait then?

Before calling him a trustworthy teacher i would call him a trustworthy hardworking, passionate human being. Whatever he does, he does with full conviction keeping atmost focus on the results and if a person with such features goes on to teach he would not just be trustworthy but also helpful, considerate and above all a student friendly teacher who would focus on results achieved through proper methods of teaching the most imp being making the fundamentals clear which goes on to make any concept easy to understand and memorise

He teaches with passion