Hi WaitinginQ
I don't get to this board very often now but I did live in KC for 7 years and had my fingerprints done not once but twice. My Wife had her's done twice there too so we may have some experience to share. Generally, they are nice but that office seems to have attitude problems and my wife's fingerprints NEVER were acceptable by the FBI. She subsequently had them redone in Seattle and cleared without incident.
Now, after you go through security, take your forms to the back of the sitting area. Don't bother getting in line or getting a number. (If you want to get in line, try the middle window with the bald guy - he is the most professional). When you get to the back, there is an office with a mail guard on the wall. This is where they fingerprint. Put your docs in the mail thing and tell the fingerprint ppl you are there. They will call you in about 30 minutes after that. These ppl are subcontractors and are very nice.
I hope this helps.
Rafiq