wing cllipping

FM, if you want to curtail their flying clip the primary feathers of just one wing. This will unbalance them.
You don't need to have it done professionally, you just need a steady hand, a sharp pair of scissors and someone else to hold your chook still.

Have a look at this thread, there is a good piccy

http://chat.allotment-garden.org/index.php?topic=50364.0

You could also cut each feather individually and close the the second set of feathers and leave the first feather unclipped for a neater look.

yes remember to make sure they have no launch platform as they will still be able to sort of fly over a fence 

correct and then after their moult clip the other side otherwise they build up bigger muscles on one side only. Clipping wings doesn't always stop them flying anything that they can launch themselves off they will