Agreed with the cultivation tips. Also most Stapeliads are tolerant of a wide range of temperatures including below zero conditions. This is quite surprising since the recieved wisdom is that most succulents need heat in the winter. I keep quite a few of my succulents in an unheated greenhouse and even a few on my very unheated balcony and they not only do fine but they look better than those kept in more heated condistions.
Watering in the winter should be kept to an absolute minimum. It's case of balance here. While the plants have evolved to grow in low rainfall areas I find that Stapeliads in particular do not cope well with long periods without water - say an entire English winter. What happens is the roots die off and while they will re-grow rapidly in the spring once water is given, there is a distinct risk of the plant rotting off. I find it better to lightly water every couple of months. A friend does this by dipping the pot in water and leaving for a few seconds. I'd only water during warmer weather - never if the plants are not heated and there is a risk of frost.
The main pests to watch out for with Stapeliads in particular, is mealy bug and occasionally wooly aphid. They seem to attract the former like a magnet! Keep a bottle of Provado handy - you'll need it!
Phil