Thanks to everyone who responded to my call for a plasterer! (Highland Parkers are awesome đź‘Ź) A few people asked me to share the responses:
Robert Dell’Aquila 412-731-3289
Kevin Deasy (412) 352-0283
Chuck Tarantini (412) 523-1589
Mike Cline (412) 583-1354
All came highly recommended. I also tried calling Michael Dell’Aquila but apparently he is retiring.