It is really easy to pull a projectile with just a screw style ball puller, one like this:
https://www.amazon.com/Thompson-Cen...uzzleloader+ball+puller&qid=1585832726&sr=8-4
I prefer a caliber specific one, that way the brass round disc is a good match with your bore and centers the screw into the projectile.
It is easiest if you can secure the ramrod (stand on the t-handle, run the ramrod through a small opening and then put a palm saver on the end, put it in a vice, etc.) and then pull on the RIFLE. I removed a stubborn stuck patch and ball a few years ago by using a milk crate. I threaded the ball puller into the ball, then stuck the other end of the ramrod through one of the milk crate openings, threaded my round palm saver onto the ramrod so it couldn't pass back through the opening, and then stood on the milk crate and pulled on the rifle. It came right out. When I had tried to first pull it by pulling on the ramrod it felt like I was going to need Hercules to do the pulling.
Putting some Kroil or something similar into the bore is a good idea to do first, to help lubricate things and to neutralize the powder charges. It will need to set in there a while to leach down past the patched RB's.
Make sure you have a pinned ramrod.
It's not going to be that hard to remove. Main thing is to not procrastinate and get it done right away...especially if you had done some shooting already and the bore is fouled with BP fouling. It will turn it into a sewer pipe in a short amount of time.