Transcription at home

In today's world everyone is looking ways to increase their productivity and save time. Transcription services able to save your time by simply dictating it to basically an online secretary or a transriptionist. If you have a good listening skills and above average in spelling, then you can make money in the comfort of your home. I have a bunch of friend who are doing transcription at home, I want it too...but I'm poor in listening skills. I even tried to enroll in a trancription school in the Philippines, I was so confident that this is the kind of job that qualifies me 100%, because I know I can take dictations fast and I'm not that poor in spelling. But I failed in listening skills, I can't get some of the words the doctor's dictated. I'm not sure if I have hearing problem or it's just the slang words. Even I rewinded it many times I still can't get what it means, so I gave up, lol. The word "Robitussin" in the dictation was pronounced "Robi-tasin", hehehe.