Um, I don't know if this will help any, but I do German and German ext. by Open High School. It's the same deal - send off work, get it back marked and more work comes. What I found good was the structure. I knew that I was meant to do 3 cover pages every 2 weeks, I knew exactly how many cover pages I was meant to have completed by the end of the year.
Is there any teacher at your school who is qualified to teach LS? There might be, even if there isn't enough demand for a class. If so, you could ask them if they'd be able to meet you regularly, to answer any questions you have or clarify things. I know you'll have a teacher for Distance Ed, but sometimes seeing a teacher face to face is better.
Or were you asking if the subject LE is hard? You might get a better response in that forum. Doing things by DE is hard because you're on your own, mostly, and it's up to you to stay motivated and get your work done. But the course shouldn't be hard, ultimately you have to cover the same dot points as any other yr 11 student doing LE, wherever they are.