In a way, it's good you're getting educated about things that can go wrong. It'll prepare you IF something happens. Like having a human baby. What do parents do? "Baby proof" the home. Think of this as a similar situation. With your guy being so small (and stay small), there are dangers that can occur. So just do you best to puppy proof your home and whatever else you seem necessary.
I think balance is the key. It's good to worry b/c it'll keep you on your toes but like like Maximo said, don't let that keep you from enjoying having him in you life.