I snaked it, used chemicals, plunger, everything.  

Snakes, tadpoles, frogs, and turtles.

Consequently, I am pretty good at spotting a snake oil salesman fairly quickly.

Mean as a snake she is. 

My handymen, change a door , replace a P trap snake a drain, all minor items, I do not care if they are insured.

I have a house built in the 1950's in SLC that I have snaked about every 18-24 months due to tree roots.

Maybe use a sewer snake. 

Inspecting a sewer line that does not back up has a very high probability to come back negative, otherwise it would have started backing up.As part of our rehabs we always snake the line out after rough in, most have never been snaked in 60 years and its better to do it before we finishe the house.

I’m 18 year old in the Phoenix area looking for solid teachers that can teach me a thing or two about this game , I’m highly aware of snake oil salesman and gurus ( GROSS!)

Many of the ones we can't work with, that have bad credit, 3 big dogs, snakes, alligators, sex offenders and such we sent to the other sources.