My computer knowledge is zero

which is why I always leave everything as default, I'm scared of installing / changing anything in case I mess up and cannot get back to what I'm used to.
I well understand where you are coming from, because It hasn't been that many years since I got my first computer, and I was probably more scared of it than you. However, if one is going to get the most out of their computer, one must overcome this fear, even though that should be done in small steps. Gradually, as a person's gains confidence, their steps become longer and faster. It doesn't take too long for a person to start jumping hurdles. I'm certainly no trackstar, because their is plenty of things that I don't know, but generally those are things that I don't have the need or interest in learning. Perhaps you are this way about adapting to a superior browsing experience.