It is very important that you have completed your course in full and passed your knowledge tests. The theory is no longer discussed in the practical course. Of course, you should bring your unanswered questions with you. Your trainer will give you all the answers.
It is also perfectly natural that you do not yet have a good command of the practice. That’s why you’re in practical lessons, where your trainer will show you how to use it in a demo. You will then have the opportunity to practise the techniques with other participants. This will give you the confidence to use them after the course.