If you as a trainer do not grab your audience's attention at the start that may lead to them not listening to you at all during the presentations.

Excuses in the beginning of the presentation will only lower people's expectations. That's not the best thing to do if you want to win the audience!

Not saying your name is simply strange. And not introducing yourself is a missed chance for you to convince the audience that you are the right person.

As a technical trainer, you want your IDEs to be demo ready to be as simple and easy to understand from your audience as possible

Whenever you are presenting, you should have clear understanding of how Duplicate / Extend Monitor feature works when it comes to live presentations.

Having equipment problems at the start of your presentation and getting even more nervous( won't help you deliver your talk better. Stay calm!

During a busy demo, there are things opened that do not bring anything to it. Your demo should be "straight to the point" and as easy as possible.

The major reason why notifications are a problem is because they distracts the audience from the flow of your presentation.

Not only it is unprofessional to have a screensaver during a demo, but what about the fact that it may not be appropriate for your audience to see.

If you want to become a professional trainer, buy a pointer. There are cheap models too. It will save you time and will help you look professional!