Little Sheep Hot Pot is alright if you have had prior Chinese hot pot experience. I find the pricing not too bad for an AYCE hot pot place.
Stick with sliced lamb and beef for meats and you'll do just fine. The seafood, though obviously not top quality, is good for an AYCE place. There are some decent veggies, and I'll suggest having some near the end of the meal. Forget the fried buns at the top of the sauce station - filling up on carbs at an AYCE place is for amateurs ;)
The place does get busy on weekends / winter-time, and so there might be a wait for the sliced meats to come out. Just enjoy the experience and don't rush it.
Don't wear anything fancy to this place (it can get messy), and don't wear any clothing you can't put into the washer, and don't plan on going out for partying/dates - you'll smell like boiled meat afterwards!