I agree with Zaffy. And as a professional dog trainer, I'd like to add this:
1.) Do not judge a new guy for incompetence or misunderstanding. Be clear and simple with what the job is and how it needs to be done. Make him repeat things, no matter if it's boring. Constuctive criticism is good.
2.) Let him know when he is wrong and when he is right. "You're doing a good job" goes a loong way. Remember how rewarding it was when you completed training amd someone told you that? Encouragement is key. A book called "the one-minute manager" is a great reference. Making someone feel welcome and accepted is also vital to good training.
3.) Lastly, make sure he is confident and clear when you are done demonstrating how to do the job. At this point in the job, no question he asks is stupid. This is when you will know you have completed YOUR job.
Good luck, my friend.
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