Part perhaps a large part of success in MS comes from trying out a wide variety of shops figuring out what you enjoy and/or excel at and what you hate and/or just seem to be less than "good enough" at. And also realizing that doing a particular job poorly one time does not necessarily mean that you are not going to GET good at it if you learn from your errors.
I discovered early that I HATED split-second timing. So fast food shops are on my 10 ft pole list. I liked almost any sort of interaction at a bank or credit union so I sought out all of the MSCs that had those shops. I was fascinated by the many ways that cash can disappear from a business so began to grab every cash integrity shop I could find. I hate hard sells so I tend to only do new and used car shops at "no haggle" chains. I love rail travel so grabbed every such shop I could in the years that Amtrak was very actively shopped.
You may see a trend here that points in one direction; most of us are best at what we really enjoy. Enjoyment as well as $$$ motivates investing the time and energy in learning guidelines checking for completeness before hitting the "send" button, etc. Finally, it never hurts to share a funny thing or some good news with schedulers. Even if they do not have the time to reply, they mostly get news of bad stuff, or no attention at all unless someone is angry. So, just saying please and thank you and some good news, and being very reliable, actually make you memorable.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.