It is very easy to do. But as matt says, the positive pressure design (the fan is on the input side - i.e. it pushes air through, rather than sucking it out) means that, if the casing isn't replaced correctly, carbon monoxide can be leaked out.
You should be OK as long as you are careful and aslo make sure that you do not catch the capiliary tube in the casing!
bazzaboy
October 2008