Usually we start to decorate the first week/weekend of Dec. But since my mom is working alot we may not decorate till a bit later this year, who knows.
I don't. My mum does, and she gets started on the wknd a couple wks before Christmas break starts. She likes it her way. I usually leave. Especially when she's doing the tree. Christmas makes her neurotic, but in the best kinda way. =)