I like to wait until Thanksgiving dinner has been eaten and then the Christmas decorations come out. It takes me about 1 month to fully decorate for Christmas. and then come January, I can't for the life of me figure out why it takes so long to put it all away! LOL
We like to do it the day after Thanksgiving. Its kind of a tradition for us (however, I keep my mom's nutcrackers and carolers up year round now). But I don't see anything wrong with putting them up now. If you like Christmas, why not?