I, too, am a medical transcriptionist/speech editor. Most of my job is 95% speech editing, but I do get a report to transcribe completely once in a while. I lucked out. I knew someone years ago that I had a big account, asked her to try me out and did it while my daughter was a baby. I got out of it for many years, and got back into it 2 years ago completely transcribing but now editing for Mass General. I never had any schooling in MT, but I dont know if that is the norm anymore. We get constantly checked in quality control and I have never scored below the target of 98%, so I guess I have a knack for it I guess. It is not the easiest job at times, but allows me to be home with my kids.
I also make more than what was described here, but, again, a lot of that has to do with speed and accuracy, which I am good at...
Good luck!