I'm getting a tattoo this Sunday...?

Sorry to tell you this but ribs is the worst place as it's close to the bone. Being tattoo'd is not unbearable but it is pretty uncomfortable. It's like a sctratching, stinging feeling. I've had loads on my arms and after a few minutes, you really do chill out. I've been told many times, ribs is the most painful. Try using some Emla numbing cream. It will take the edge off it but only a little (about 30% less pain - leave on for about 2 or 2 and half hours before the tattoo is done) . Good luck!