Tubular Bells
It depends on how good and how dedicated you are, and how good you are at self-motivated, lone learning. I have an interest - I teach in a full-time groundschool, though we are about to start distance learning and I actually get extra work if we enroll DL students (as they demand individual attention with their questions during the distance phase). I still say however that if you are able to do so (financially and the time commitment) sitting an attendance course is far better for most people.
These exams are difficult, and require a lot of work. Many people find steady work easier in company, and in class.
Best of luck!