I think it depends what exactly you plan to makeover. Do you
want to makeover a whole room or just upgrade a room (from an old
fashioned 90's room to 2011 modern clean chic)? Just upgrading a
room is fast with little changes in furniture, curtains etc. If you
plan to makeover a whole room, that will take more time. Here is
some infor that will help:
http://www.ehow.com/how_5892055_home-makeover.html