You offered a great DIY article on this. My only question is how to do the frames that are attached to the wall. Do they require the same process? If I took my doors and hinges off, I’d still have the skeleton of the cabinet. How to refinish this part

My kitchen cabinets are oak, whitewashed. I want a nice warm wood color stain. Do I have to strip the cabinets first and then apply a new stain? What is the process? What is the best and easiest way? I have a lot of cabinets!!