My Uncle's 1st wife took a sledge to the wall in the kitchen while he was at work...when he got home, she had the sledge against a truss "holding it up". 8 foot celing remodeled to a 6 foot ceiling.

Do you have attic above? If so, that can help.

Highly unlikely that a 3 foot wide wall is a bearing wall if it is in the interior (not abutting an exterior wall).

With PEX, moving supply plumbing is pretty easy now. Good plumbers are re-piping entire houses in a day. Sanitary sewer is still a bit harder, but it usually is a case by case endeavor.