In order for range work, practice, to help, one must know what they are trying to do -- where they are going. To discover a swing on your own takes a lot of trial and error and more than a little luck. Most of us never discover a repeatable swing on our own. So, I'm in the "get at least one full swing lesson" group.
To your original question, most of us are better off hitting less balls and working on positions. Take time between each swing -- don't just rack balls over and hit again and again. Set a club on the ground for alinement. Notice that almost all pros do this every time on the range so, what makes me think I don't need this. While working on your basic swing, less club switching is good. You are working on the swing and less variables are better than more. Work on one thing at a time and try not to care about ball flight. For example, when working on path, you may hit bad shots but get the path right. That is called progress. When at golf school, we used 6-irons for almost all general swing work. We used other clubs too, but the 6-iron was used while working on general swing issues.
On other range sessions, you may want to create a game and just hit balls at targets with different clubs. This, for me, is not the same as working on my swing.