Not too bad, if you are very careful, you can pry, but some can be very stubborn.
Did one once while engine was in, had a nice little special pry bar, and it came off without much prob.
Friend of mine tried it, could not get his off
There is a cheap puller you can buy, and I think it will accommodate what little space you have in the engine compartment to pull it.
Why do you want a degree wheel? - looks?
Matt