I have a 100 year old house in the Midwest. I took off a chair rail trim that was put up in the last couple years. Removing it peeled off several layers of paint from the wall in a few spots. And looks like it may have gone down to the plaster in a couple of the spots. There's now a line around the room that's maybe 1-2mm below the level of the current painted surface.
What would be the best way to smooth this out? Sanding and spackling? I'm a total noob to this.