If you go to completely flat finish, you will see every imperfection, if you go with a knockdown or orange peel finish the imperfections will disappear and you will typically have a very nice finish. There have been several threads in this in the past as well as info on DIY projects. As i recall this was generally considered a messy project, I do not recall any costs on contractor info.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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