All of the dents I can see can be bumped out without using a stud gun. All you really need is a low crowned dinging hammer, an anvil and possibly a shrinking pick. Buy yourself one of these books. http://www.autobodytoolmart.com/martin-key-to-metal-bumping-instructional-book-p-13673.aspx and read it carefully. Some of the parts of the book are no longer relevant. Using a little bondo instead of lead won't hurt anything. But the basics of body bumping haven't changed. Then find an old junk vehicle, preferably 50 years old or so and knock some dents in it. Practice bumping the dents out. The vehicle you have pictured is too nice to practice on. Bumping is kind of like welding. If you really try, you can get pretty good at it with some practice. Becoming an expert takes years of practice.