Would assume all following this thread wish you luck! Sounds like you have a great approach and deadlines do work for most things. Just jump in and have fun, even if things do not work out with a good audiance.
Depending on what type of store(s) you have selected, you might find a semi revealing / sheer top to try on and wear it outside the cubicle [with or without anything underneath] to look at it "in better lighting" or a better mirror even if there are not other people around. Might help expand your comfort zone for Saturday!
Good luck!