Mark La Pointe (silent “t”) is a Canadian VO guy who uses the moniker “Killer Voiceovers.” He wrote an article this summer about a studio session that rings true. It includes sound advice about getting to the studio early, doing your homework on the client, being patient, bringing a pencil (you do have yours with you and sharpened, right?), looking for the key words and not taking requests for multiple takes as an indication that you stink.
It’s a good read. http://www.killervoiceovers.ca/marks-blog/voice-over-fun