That is such an open ended question that it's hard to give any definitive response! It's almost like asking how do I fix my car without saying what the symptoms are or what kind it is...
Yes, all of those things you mentioned are possible. Whether it will be easy or hard just depends. Whether you can do it without tearing up the walls and ceiling depends on your skill level, tools available, and what's there now. The undercabinet lighting complexity would depend on whether the things are line voltage, low voltage, and whether you want a separate switch (or use a built-in one) or if you want to be able to dim them. So many choices, very different products and install requirements.