Hi FCP,
Will recommend that you take at least online lessons and get the softcopy notes if you are unable to make it for the actual classes for Level 3 and F7, F9 papers. But if you're already in the accounting lines, then you should be able to do it by getting help from mentors where clarification is required and lots of practise. Try it for a sem and see whether that works for you.
Last I'm aware of, Kaplan offers soft copy notes from their lecturers while LSBF has both notes and online resources access. I prefer the notes from Kaplan though.
And if you really ain't gonna take up lessons, at least take up the revision courses from Kaplan which had helped me tons as I usually had to skip my tutorials.
Hope this helps!