Maybe, maybe not. One of mine came off very easily. Loosened the allen key and it screwed right out. The bolt head on the other one was rusted pretty bad, and I think I might have stripped it attempting to get it out. I might have to use a drill to pull it out now.
So the answer to your question is: They should come off easily, but there are always exceptions to the norm. If it's rusted or stripped (or both), it will be a slightly more involved process.