Its extremely simple work for the most part, replacing batteries, selling parts, and suggesting products.
However, the customers that come into the store absolutely make it depressing. You do get your average person that's coming in for a few things, smiles and gets what they need.
While its normal to get distraught customers at any job, a lot of the home mechanics that came in were beyond disrespectful. Some would grab and throw items because they were angry, just like little children. Most would simply harass and berate you, even if you weren't the person that sold them the incorrect product.
Unfortunately, as I was harassed, management looked the other way. I was powerless to assist angry customers 99% of the the time and just simply had to take the abuse day to day.