I did the sheep snuggle with photography twice. Melanie was amazing both times -- very accommodating to our last-minute changes and easy to reach. She knows and loves these sheep, so you get a lesson about sheep breeding in addition to the experience and the photos. She's an excellent photographer, and she's willing to help set up a great shot if one isn't happening spontaneously.
The barn/shed smelled like a barn much more on my second visit. This is to be expected, I suppose. Wear closed-toed shoes, expect to get dirty, and if you're driving a long way afterward, bring a change of clothes!