I am not sure if you are attempting to do this alone or not.
But if you are alone on this, you might want to put a carton box under the bumper when you are pulling it off. Like said above, the bumper is quite heavy and very cumbersome. If all the bolts are removed completely, the bumper itself should pull right off. However, the studs on the corners are quite sharp and can easily damage your paint if you are not careful.
Other than that, the mechanical parts are not difficult to do.