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 doubts arise on the path, keep sitting! Functioning in the middle of doubt can help you see the truth of what it is that doubts.