The pic you posted is similiar to what we get/see here in W. PA.
I wouldn't call them brazen. They're smarter (for self-preservation) than that. They're just accustomed to seeing people in certain areas. Around my back yard, yea, they see me and "expect" I won't do anything to harm them. When I go back in the woods (just 2-300 yards back, in an area they are hunted), they'll be a lot more cautious.
Oh yea, forgot to mention a thought on this statement:
"I may be the poorest shot known to mankind. Those turkeys are safe. They're more likely in danger of hurting themselves by crashing through those trees than they are by me shooting at them"
If you are going to take up hunting, I wouldn't start with turkey using either gun or bow. In their environment, they're normally too smart for a rookie hunter. A seasoned hunter can go days without getting one.