One bad apple does not ruin the whole orchard.
You had a bad experience. Was the guy that came to snake your sewer a plumber? Or a "drain cleaner"? There's a difference--one goes through several years of apprenticeship, the other goes through a few minutes of training. One is a professional, the other is not. If it was a plumber, perhaps he made a mistake. He's human.
The only time I see people suggesting hiring a professional on this board is when it is (a) required by law or code, such as tapping a city sewer line in this thread, or (b) necessary to prevent someone from harming himself. The latter results from a poster's apparent inexperience, or the inherent difficulty of a job.
Since you're on a septic system, why don't you call your local sewer authority and tell them you'd like to connect your household waste line to their piping yourself, and see what they say.
Certain tasks may seem innocuous, but without the proper experience to know whether something is right or wrong, you could cause harm to yourself, your neighbors, or both.
Finally, from Webster's:
profession (n)
4 a: a calling requiring specialized knowledge and often long and intensive academic preparation b: a principal calling, vocation, or employment c: the whole body of persons engaged in a calling
Finally, a disclaimer: I am not a professional (I am a professional, just not of the plumbing persuasion
). I am not a plumber advocating that people call other plumbers just to gin up business, nor are the many licensed professionals that come here to share their knowledge. Anytime someone on here suggests calling somebody in, it is with good reason. Sorry you had a bad experience with your local fellow.