The first time around I was petrified and it turned out to be a long and hard labour (24 hours), and had the full cocktail of drugs to get me through.
So second time around, I was determined to just get a bit more control and not let fear control me, and so I used that determination to my advantage and made it empower me the second time. It was alot more straightforward, and yes, shorter! I had no drugs second time around, and that is testament to how you can use that knowledge from the first time to your advantage.
So I went determined to get through it faster and more in control, and if possible, without drugs. It went from 24 hours to 6 hours second time.
Much better experience all round second time.
At the end of the day though, the biggest thought in my head was that it won't last forever, as my husband kept saying it's such a small time really, and soon get to meet baby. But let the experience of the first empower you for the second. It won't ever be as bad as the first time in some ways because knowing what it is like takes some of that fear away. Plus your body should know what it's doing the second time so hopefully it will be easier for you and quicker.
Good luck, I'm sure you will do fine and just think in no time it will all be over.