Good luck with it, am sure it'll be fine, Ronnie-baby has done it and posted some bits in a thread here http://www.lovehoney.co.uk/community/forums/sex-tips-and-talk/372259-pole-dancing-anyone-ever-tried-it/ Maybe try to catch her online and ask any questions.
Am sure the teacher and other pupils will make you feel very welcome, every is new to it one time or another :)
A friend of mine did it a couple of years ago, and absolutely loved it, and she is a very shy quiet girl, she got really toned and lost some weight doing it, and heartily recommended it :)