I had my breast bone wired post mitral valve replacement st judes valve, in 1990. It really wasn't " painful " but more of a nuisance, that required planning.
Example, do not wait till last minute to use the restroom or if you are going to sneeze splint with your pillow to aid pain control and healing.
Learning and practice before surgery toget out of bed from a flat position to raised position also helpful. I used tylenol to help before sleep. There are weight restrictions post surgery. The biggest thing is ask for help