WOW! waiting til Christmas will be hard, but oh so worth it!! Congrats
Moe, i agree with Erin about playing around with the blade. i can never remember when you should tighten or loosen! so i have to play around til i figure it out.
if you use a spray adhesive you will want one that can be temporary. i have tried Elmers Craft Bond, it is a dual glue, meaning it can be permant or temporary. the can will describe for you how to get it to be temporary.
and you will want to clean it between sprays or it may build uneven layers on the matt, baby wipes work well, but you should get several uses before needing to respray.
and be careful, as some spray adhes can have an odor.