Keep It Positive!
The quickest way to get a child to shut down and lose motivation is to lose your own patience. Consider a time in your past when you were learning something new and how it felt when your trainer or teacher lost his/her patience with you. For as much as you became even more flustered and discouraged, kids shut down all the more under similar circumstances. Instead, give praise and offer encouragement. Basically, remember to keep your cool and your kids will too!