just did 2 at the shop last month, both very difficult to get off, just make sure all your tools are in good condition, so you dont strip anything, and put some muscle into it. Its scary as shit, but that BANG when it comes loose is sooo rewarding!!
There is no chance of the sprocket digging into the hub like an aluminum, the worry is all on the threads. you can see the portion that turns to remove the cassette below, the cassette removal tool turns the internal part