Go to both interviews so you have some options. Don't tell Maccas about Coles just maybe say you have been looking for a new job and have applying at a few places. About the other job...Do you think it will pic up? Don't tell the interviewers about it just yet as to see what happens with it...
I'm making a really brief outine mindmap on A3 cardboard to put up on my wall in my study - should help if you are a visual learner and like using colors. (That's what I plan to do anyway)