The first thing you need to realize is that you can do this.
No matter how difficult it may seem, you have it within you to be the exception.
If You’re Just Starting Out
If you’ve never worked out before, consult with your doctor first. You want to make sure you don’t have any pre-existing conditions that might be exacerbated by certain types of exercise or that you’re predisposed to any particular sort of injury or hurt.
Barring that, my advice to beginners and those worried about injuries is to start slowly. Don’t just jump right in. Your body needs time to adapt to the new stress you’re going to be putting on it and while it can adapt pretty quickly, overtaxing your body is a sure-fire way to injure yourself.
Start slow and just start moving.