lol..it can hurt pretty bad. i have 2 kids..gave birth with an epidural for the 1st and natural for the 2nd..contractions are a bitch, but once the baby is born they instantly go away. IF (and its a big if) i ever had a 3rd...i would do it natural.
A comedian once said "My wife couldn't even sit down she was in so much pain. So she had her head out the sunroof and was screaming and to see the woman I love in so much pain... I was just laughing. So we get to the hospital and the doctor wants to run some tests... To see if she's IN PAIN. I was like doc can you not see my door handle in her hand."
giving birth is very painful and since you want to know on the scale of 1 to 100 what the pain is I tell you is 100. but be not afraid of the pain for God created you to endured such pain,at the end when you carry your child on your arms you'll discover it was all worthy.