But aren't you basically always doing this, is the point? A house is never going to be 100% to your taste unless you did it yourself.
If you are picky about decor, you are always going to need to budget for changes.
Most people live with it for a while and do it bit by bit.
Sometimes you find you like something more than you expect to after living with it for a while, too. I didn't love the paint colour in our reception rooms - white, ironically! - but having put up a load of art, actually it looks fine and I will wait longer to replace