If you don't know the answer, admit it. Give concrete examples so the student can related to the training point. If you don't know the answer, admit it. Use demonstrations Have the students demonstrate to you and the rest of the class what they learned during your presentation. The purpose of the demonstration is not to embarrass the student, but to make sure they learned the objective of the training.
Evaluation Ask the group for comments about the training.
As a trainer, you should be prepared to learn from each training experience. If the student didn't like the training, ask how it can be improved.