Replacing the start, how do separate rate the starter from the engine (it is stuck)?

The starter wouldn't work. Banged on it (old school). It worked but didn't the next time. I took all proper steps to remove it but it won't separate from the engine. Someone told me the Bendix gear might be stuck. Thought I might be able to manually rotate motor to maybe free it if it "is" stuck on the flywheel, but I don't quite see how I can do that. Camshaft pulley nut very difficult to get to.