Something fairly simple is my goal. Obviously ANYTHING will be an improvement! After picking away some of the cracked sheetrock mud and texture layer, it looks like the sheetrock itself is not damaged as I thought it would be. If I scrape away that mess and remove the corner bead (which I'm guessing will be necessary?), looks like I might be able to install a nice wood sill with some trim underneath and have a nice looking end result. Hopefully I can patch up the vertical corners and not have to redo all the way around which would require cutting down and reinstalling the blinds!
I've done some finish work before - baseboards, chair rails, door trim, stuff like that. But never a window sill. Is there anything in particular I need to know before digging into this??