Epidural...how much does it really help?

Jen
My DH and I are just starting TTC and I am not pregnant (yet) but I'm just wondering about the effectiveness of the epidural. I'm a complete wimp with pain so I'm 99% sure I'm going to go with an epi, but I wanted to know just how effective it is. Can I ask the anasthesiologist to basically numb me completely? I'm actually most concerned about the crowning since I've heard it wears off...I don't want that!!
I'd love any feedback - have any of you had an epi and did (or didn't) feel the crowning/"ring of fire"? Thanks!!