I just want to say, I can see how my OP may have appeared a bit lackadaisical, but that's not me and that's not how it was meant.
I am aware (and more than a little daunted) by the amount of work that I will have to do for a degree and I do worry that I won't be good enough. But I have passion for the subject and a desire to learn and do well and I feel more determined about this than any other career/interest/whatever that I have considered. At school, I didn't know what I wanted to do, I enjoyed English and Maths and Science etc, but no one seemed to inspired me to pursue the subjects. I started A Levels in subjects that I wasn't sure about and I ended up leaving as I just wasn't as interested as I should have been. Only in my twenties did I discover how much I enjoyed astronomy and came to appreciate the workings of the Universe and everything in it, but I doubted myself. And then I had my children and I doubted myself further and thought that was it and there was no chance for me to do anything about it. Only recently have I realised that I can do something about it - I was concerned that it was too late and that I didn't have enough time - but I've realised that if I want it enough, I will make time. I have already started studying algebra again, then I plan move onto geometry, trig, calculus, biology, chemistry, physics and astronomy, reading books, practising the subjects etc. I have seven months before the course starts and I intend to learn as much as I can before then so that I don't feel too out of my depth, so that I will have faith in myself to go further and do well and eventually make a career for myself out of something I love.
Sorry for the rant but it just seems that I may have come across as someone who doesn't really give a stuff and just wants a career in something she knows nothing about and doesn't overly care about. I assure you that is not the case, I will work my @$$ off for this.