If you are going to use Steel Rivets, then you have a few choices to choose from-
1. Use a Squeeze-
2. Get a Bench Top model-
and, don't forget to buy a Die Set for either-
3. Buy a Rivet gun (generally, 3X is best for most things)-
and, the Rivet Sets-
and, Bucking Bars-
It really depends on what you are doing, what kind and how far they are from the edge of the part, or where in the Car they are located.
If it's a part that you can Rivet before the install, a Hammer and Vise can do many Rivets, or a Hand Squeeze can do them faster and better, but they have limited reach.
A Rivet Gun will set about any of them, but it takes practice to understand how hard to hit them, and you don't want to be banging them in-just 3-5 hits and they should be good-it's like Welding, you mess up and learn. If you are Riveting on a car, you will probably need a helper to hold the Bucking Bar-I will generally make a few pieces, clamp them in a Vice, then have my helper watch what happens when I hit them so they can understand what to do-
I will use a Roper Whitney punch (if I can) to make the holes (better), or a drill (not as good), Cleco it together, and Squeeze or Rivet-