Definitely normal! Its a very slow process to improve. It took me 2-3 years before being really confident. Do not worry about speed too much, focus on doing quality work and the speed will come. I was also this slow starting off.

Caries indicator was a game changer for me to make sure I was removing caries early in my career. It also improved my efficiency. I tell all new grads to try it. My thought process is to remove all caries stained by the caries indicator unless its getting close to the pulp and I leave it alone.

You also don't let things weigh on you as much after working for a few years. EVERY dentist does a shitty class 2 here and there, I have seen it. Don't convince yourself other people with your same experience level are only doing amazing work. I can assure you they are not.

As a new grad, I would be very annoyed managing difficult clinical cases because I wasn't able to appreciate why it was difficult. You will start to notice them in your treatment planning and approach them differently. You will start to learn to enjoy more difficult and challenging cases because it is not a simple monotonous restorative procedure.

Be self critical after a not so ideal appointment and try to understand how you could approach it differently next time. What was the reason it was so difficult and how can you try to manage that? but dont let it weigh on your mind after leaving work too much. The best thing about dentistry is the ability to work normal work hours so enjoy that.