The Little Giant can be very very tricky and has left many folks frustrated and heartbroken. Apparently is does best in a draft free room where it is messed with. I highly recommend you don't use the thermometer that came with it. There are many good threads here describing how folks get the best results with the LG.
Thank you for all of the replies! Girls and I candled yesterday - 27 of 27 are developing!!! Used several of the tricks you all pointed out in the LG Tips link, and so far so good! Only 5 days into it, could still have quitters, but happy we are off to such a great start!!!
I dont have one but have read A LOT of threads on them. One thing I read that sounded prudent was to put it in a closet or other completely enclosed space so drafts and temp changes would not have such a big effect. Good luck, it is very exciting the first time you see one pip.