Yes, it is a poor design from the view of installing it, but if you're careful, it shouldn't be a problem, and once it's fitted, it's fitted, David. If you're going to look for another heatsink / fan, make sure it's Intel compatible, as I don't think the Athlon type will fit.
Oh yes, PC building is fun, and no matter how smoothly you think things are going, there's always a spanner just waiting to be thrown into the works!