Hi Trish!
I'm sorry to tell you that all my labours were long! Here's hoping that your second will be short & sweet.
I found the following helpful:
1. Rest as much as possible in the last month. Give in to every desire to nap, and take your bedtime very seriously.
Keep in mind that part of the reason you were so exhausted with your first is simply because you were awake so long. If you labour during the day, you will have a tremendous advantage (sorry, I know you have no control over that factor). My 3rd baby's labour started at 5.30 am and he was born at 9 pm. I felt great the next day in part because I was then able to fall asleep at a normal time, and did all the work of labour in normal waking hours. This was a direct contrast to my 2nd, born at 8.30 am which meant I was up and hard at it all night.
Was your DS posterior? If he was, then that is a common reason for prodromal labour. I would then also suggest doing all you can to ensure this baby presents OA.
2. Keep well hydrated during labour and eat if you feel like it. I never felt like eating very much. Just like Willow--everyone kept urging me to eat and offering me food, but it was the last thing I wanted.
3. Labour in water as much as possible. This is my BEST tip. My third baby, my best delivery, was born under water. I had kept that in mind as an option but hadn't made a firm plan for it. When the time came I was so comfy in the bath that staying there seemed like the obvious thing.
4. Good support in labour. My dh was there of course...and I was lucky enough to have private midwives with my first two, and the same public midwife, who put herself on special call for me, for my next two.
5. Organize good support at home. You need to feel secure about your DS's care whilst you're in labour; if you are worried about him then you won't let yourself "go" during labour. What sort of help will you get at home during the first week or two? You should be coddled until/unless you feel like doing more.

Are you keeping up your iron? A low iron level can make you feel tired in itself, both before delivery & after. You can ask your doctor for a blood test if necessary, but otherwise eat plenty of leafy dark green vegies and consider an iron supplement. I like the chelated iron, I think it's better absorbed. I needed the supplement--I could not keep my levels up otherwise, as shown by blood tests!--but I tend to be slightly anaemic even when not pregnant.

YOU CAN DO IT!