Restoring oil paintings

I know that no one on POL would be mad, sad or bad enough to try restoring an old oil painting.  If ever you were tempted, however - just in case - do look at the work of Baumgartner Retoration, on YouTube or Patreon.  The complexity, the skill, the experience, the required equipment, are all leagues beyond  anything I'd envisaged - I knew it was difficult and exacting work, but I really had no idea of everything that was involved. Do take a look, and be amazed - particularly take a look at a painting that had been "restored" by an amateur, and rescued by Mr Baumgartner - the whole painting, which would have dated to around 1820, by the look of it, had been entirely overpainted, every bit of it, with modern oil paints but with very, very little of the skill of the original artist.  It looked just about OK from a (quite long) distance; but the closer the camera got in, the worse it got - how can you DO that with a vintage painting?  It wasn't quite as bad as the "Monkey Christ", the retouching and virtual repainting of an icon in a Spanish church; but that makes it worse, really - because this horrible job was done by somebody who obviously did know a little about painting: but nowhere near enough.    Do take a look, I think you'll be amazed by what a really good conservator can do - and this one is a man entirely without vanity: he doesn't call himself an artist, but he clearly is.  I found the videos fascinating - so, I'm sure, will you.