Learning happens overtime. If you do something perfectly, you are no longer learning. Therefore, as we make learn we make mistakes. Mistakes are good. In my classroom students will be assessed based on what they can show me by the end of the course, some students may get it right away, but that doesn't mean they should get a better mark than those who get it by the end. With both Programming and Electronics, one little mistake and make a huge impact, but that's okay troubleshooting is part of the problem.