I put a thread on her a while back, type "R26 bumper replacement" in the search bar. Not a step by step photo guide but I have listed the fixings which need to be unfixed and the tools towards the end of the thread. Any queries give me a shout.
its not too bad, the hardest part I found was the clips into the headlights, but if you gently pull back the top section you can use a flat bladed screwdriver to release the bumper from the clip its scary how easy it is to remove the bumper once you see how little is holding it in place
There's a good guide on meganesport.net for front bumper removal, search google for 'megane intercooler fitting guide'