Can a layperson dare to handle the baseboards themselves?

If it lies crooked in the drawer like in the photo, then the miter angle also becomes really weird.

Now I don’t know, is there a trick to reliably fix it so that it stands straight and the cut is correspondingly straight?

Thanks, that’s a good idea. I took a small leftover piece of molding, but it’s just a bit too thick. I’m looking for something thinner and will put a rag around it.

Thank you very much for sharing. The silicone advice is worth its weight in gold, you will be amazed how quickly self-criticism morphs into satisfaction.

The mysteries of geometry :p

Fix the workpiece and fixture as below.

Saw 2 leftover pieces so that you get blunt wedges. that way it clamps easily and precisely. fix the saw fixture to a heavy object if it wobbles on the surface, then your saw wobbles along with it.