Berri - I would highly recommend your DH reading the Maggie Howell book too. I practically forced it in my DP's hand each night after I'd read a few pages. We too did the course (which was expensive but well worth it).
I had a visualisation that I practised over and and over whilst listening to the CD's from about 32 weeks.
I think the "riding the contraction" out was the basis for my visualisation. Some people use waves, I used a loud train driving past me!
During our course the teacher (also a MW) got us all to relax and think of a beach, or really special place. My 'special place' is somewhere in Devon (I know not, some white sandy beach in Mexico!) and it is near the train line. So, my 'riding the wave' was walking out of our holiday apartment, over the bridge and waiting for the train/contraction to come, once the train passed under the bridge I could walk back down and to the sea front and watch the waves in the sun set.
It sounds strange written down but it is very visual to me as we holiday there every year so I know the place well.
During actual labour, I struggled for about 2 hours to calm and 'find' my place. This was because I was disheartened that I'd only got to 3cm and thought I wouldn't cope to the end without pain relief. But I did get there (with my DP's help - he was amazing, as he'd read the book and done the course and knew my special place) and talked me through the walk over the bridge through each contraction. I got to 7cm without anything and then had g&a.
My whole (intense) labour was 11 hours, but it felt a lot less than this, time slipped by and DP does say that whilst I was loud for about an hour (when we realised I was only 3cm), I was very quiet for long periods of time once I calmed down.