Bloody hell that sounds painful, I cringed reading it
You can do it. I've done it myself, you have to remember it's not like cutting your arm off it's your body doing a strong work out.
I personally did find it painful, but my first baby was back to back, once she had turned and I got to the pushing stage it didn't hurt much at all! It was wonderful
Don't forget there are things you can do to help with the discomfort, water is out of this world amazing, tens machine and I haven't tried it but a comb is meant to be good.
Make sure you're drinking and weeing enough. Move around the room.
Make sure you feel safe, so the room is dark and your partner is stopping people from just walking in Willy nilly, don't lay on your back
Also make sure you do your research about pain relief, then if you decide you want it you can ask and you'll know exactly what to expect. I would also put it in your birth plan that they don't ask you if you want pain relief, but you have to ask them.