i have done loads of vinyl work as used to work for a sign company and was mainly using vinyl.
ok the serface needs to be very clean and totaly smooth mate. rub it over with a good degreaser and dont let a single bit of dust or anything on it. if you are doing a big bit like a bonnet lay it on the bonnet where you want it and fold it in half right down the middle from windscreen to tip of bonnet. so its all folded over on one side of bonnet. then peed the backing off and cut. then slownly work your way from the middle out doing one side at a time. if you get a bad crease lift it back off stick your hund under it and lightely use the heat gun on it and the memory in the vinyl will take the crease out. then once one side is done to the edge fold back the other side and do the same. then work your way round rubbing over the edges and cut around leaving about 15mm over hang. slit the corners outwards then use the heat gun gradually round to fold it under.
the places where you will have problems is once you get to the wheel arches. hard to explain hoe to do them but just remember you can alway bull it back up and use the heat gun plus your hand under it to get the creases out.
hope this helps mate.
