A student of Amharic can benefit greatly by starting to learn the Feedel at the same time as he or she starts to learn the language. 
Once students master the Feedel, they will recognize all the sounds of the Amharic language. Based on the physio-linguistic leverage you will have gained by mastering the Feedel, you will be able to utilize written materials to easily build your familiarity and knowledge of grammar, vocabulary, and even speaking.