If you were to change out the vanity, how hard/$$ would it be to put in a normal, narrow vanity or pedestal sink? Even if it is narrow, I’d rather not stand kitty-corner to the toilet while brushing my teeth; back up wrong and you hit the commode?

I haven't always found agents terribly helpful in setting prices. Don't let anyone talk you into setting too high a price which will just cause your house to languish on the market. If you're a little low, competition will drive the price up.

Yes to this a thousand times!