An additional challenge for student teachers, and for any teacher who is teaching a lesson for the first time, is that often a lesson does not go how you planned what so ever.
I experienced this last week when I gave a math worksheet to the students that was unknowingly too hard for them. Hands were shooting up everywhere I looked, I couldn’t give anyone the attention they deserved because there was too many people with questions, scanning the room was nearly impossible with so much going on, and the students on the lower end who needed extra support hardly got any. I ended up having to stop everyone and just go over the worksheet as a class. I was very disappointed with how this lesson went, and I wished I could do it over again. I know that if I did I would tweak a few things and everything would have gone a lot smoother. It is sometimes difficult to find that perfect level of stretching the students knowledge, without making things too difficult.
A lot of things in life are not perfect the first time you do them. Things don’t always go as planned, and there are frequently unexpected speed bumps.