How difficult is it to change out the wallpaper in a TT?

One thing I did to add some color and personalization to the blah beige walls that came in my TT, was print poster size versions of some of my favorite pics from previous trips... a sunset on Mississippi River, a lake with trees reflecting in it, a path in garden with azaleas blooming. Since my upholstery has burgundy spots, I chose pictures that had reds/burgundies in them (at least some). those pictures also had greens allowing me to introduce another color for accessories. I put posters in inexpensive frames (the kind that have plastic instead of glass) and hung with command pictures hangers. by ordering prints when Walgreens had a deal and buying frames on sale, I spent much less than what paint or wallpaper would have cost... and if I decide to change, it is simple to insert a new print.. or move to another RV.