My advice don't jump too far ahead. I had an interview last month for part time admin position and I was soo worried about my Uni course and fitting it in and planning to get there that the interview didn't go as planned.
cazcaz, by now you have probbly had the interview and maybe even know the outcome, but you seem to have listed all the negatives pretty succinctly- what are the positives about this job/ LA, apart from the fact that it is paid???
I know it may sound trite, but I do still find that listing the pros and cons of something side by side can help me make a decision when I am dithering. It's not always just a case of which the longer list is, but the relative importance of the items on each list too, that often helps me think about something more clearly.