I realize that after Christmas, many people are at the store returning, or exchanging what they ha gotten as presents.
One way to avoid that is to get something special. Getting personalized gifts for her, or for him helps. If you know the types of things that someone wants, or something very specific, it does save a lot of hassle.
I am fortunate in that my tastes are simple and I like almost every thing that I have ever received. In fact I remember one Christmas I received blocks of plain paper, crayons, tape, scissors, and lots of coloring pencils. I had a ball.