This is an attitude adjustment the potential teacher must make. It is not correct for you treat your students like subordinates in the classroom. In the classroom, your students are your clients and they should be treated as such. This is important because you want to foster an atmosphere where students are willing to make mistakes and learn from them. Mistakes are discouraged in the work environment but encouraged in a learning environment.
Adult learners are different than young learners .
Adult learners will evaluate everything you try to teach them so spend some time explaining why something is important to learn. Provide more breaks. Adult learners cannot sit in the same place as long as kids can. This is especially true of construction people who are accustomed to being very active. I like to schedule at least a 10 minute break every hour.