My only concern is that, in the end, you may not need all of those parts. Instead you may need, for example, a rebuilt power steering box and a few of others. I have a mechanic where I live who just loves to sell parts because they can mark them up and then include the labor. Nonetheless, you can probably return the ones you don't need and if you get a good mechanic he'll probably tell you what you need to do/not need to do anyway. It sounds like you have a good referral.

But in the end, I have this advice to you in lieu of therapy. And yes, all of this can drive you to the need of a therapist. You need to learn everything you can and get in there with the car. With the new mechanic, you need to be there when the car is checked over and the wheels are pulled. Know what you are looking at. Don't rely on any one person to fully trust in this process. You need to own a good part of the knowledge here and use resources like this great website to help guide you. Take everything with a grain of salt and learn, learn, learn what you can about your car, trends with the car, and real costs involved.