Practice pain relief techniques whilst it isn't 'too' bad so that you have it cracked when things get more difficult.
These techniques also help to intensify the contractions and flood the body with the right hormones to get labour going proper.
When you feel the first cramp/contraction start, get into a comfortable position, and breath out whatever breath you have slowly. Then breath in as slowly as you think you can manage (try to get up to 25 at least with fast counting to get a feel for it) and then breath out as slowly as you can manage (Again aim for a count up to 25).
It will become second nature and you'll always know that a contraction will be over by the time you have breathed in and out, - which helps you not to panic.
You can also try a partner very lightly dragging their fingers up your back either side of your spine and then down again, - fairy touches.
This combination really gets the natural endorphines going as well as the labour trigging hormones, but the breathing can alone.
Once you have got to grips with the breathing, think about something that makes you go 'Mmmmmmm' if you can, as you start it.
Hope that helps. Start this now so that it is all second nature by the time it gets a little more difficult.