Hi,
this video shows how to replace the timing belt on a 206 with 1.4l enigine
http://www.youtube.com/watch?v=VCe7r-Ke_wQ
Usually the tensioner and the water pump should be replaced, too. But the car shown had a very small mileage. The video demonstrates that the work can be done without dismounting the right engine support.
Enjoy it,
Jürgen