I'll second that lindsell, I was able to understand the sensations more the second time and tell the mw the baby was coming down, whereas the first time it was just this huge horrible tangle of agony which seemed to have no end.
I think in your second labour (bearing in mind I have the benefit of being able to look back on two "normal" births) you remember the pain and the sensations, you know how bad it's going to get, and that it won't get any worse than that. The first time you have no idea so you imagine it's going to get even worse than the crowning bit- you start to panic and suddenly they're out.
Second time it's like, I remember this, I can do this. Still hurts, mind!
you'll be fine.
Some people count through contractions to help them see there is a beginning middle and end to them. What I did was just inwardly chant "it's just a contraction. It's just a contraction. I'll get through this one and then I can have my epidural"
and I got through 90% of them like that, then the epi man came, it didn't work, tried again, it didn't work, he went to try again (well why not, its only my spine you're puncturing) and I said stop because it was too late as the baby was coming, and it was all fine anyway. I only wanted the epi out of fear from the last time, as it turned out it was just a lot of bloody unnecessary fiddling about and I coped fine without it anyway. I wouldn't/won't bother next time, assuming everything is normal again obv.
Long ramble there, sorry!