You should really look at the teacher closely. Take all the time you need and don’t do anything unless you have to. Once you make a commitment, stay with it and give it the benefit of the doubt. Having doubt is part of the dynamic. It is space that you disagree with; a not knowing that you think shouldn’t be there. A little bit of doubt is valuable. It is certainty if you do nothing with it.
When establishing an awareness practice one can attempt this without a teacher. However, this often leads a person to a dead end or to what Chogyam Trungpa Rinpoche calls a Spiritual Supermarket. Sokuzan discusses further in regards as to when you may need a teacher.