I found the flexiwrap quite easy to use. You need to make sure you have some gungum repair putty as well. Holts have an online video tutorial that shows how to use this and their other exhaust repair products and I did find it useful watching that beforehand. Also the clips that the strap slots into can get a bit flattened which can make it difficult to get the strap to locate into the clip when tightening the strap. However the clips can easily be prised open with a small screwdriver and then the strap located into the clip and I could tighten it without any problems
The car is much quieter now with no sign of leakage so it seems to have done the trick.