right guys decided i was going to tint my headlights and thought while I'm at it might aswell put a little guide together.
Tools;
scalpel
old card bank, credit or casino in my case
spary bottle(water and a little washing up liquid)
missus' hairdryer or a heat gun
and rag/towel
not the manliest set of tools ever but hey ho
first cut your film to the general size of the light
next you want to spray the lights and wipe all the dirt of ensuring that the surface is clean.
now for the hard bit take the backing sheet of the film(trust me its a b stard)
give the light a good spray and spray the sticky bit of the film.
place the film onto the headlight.
now using the hairdryer/heat gun use your card to move all the moisture from underneath the film, starting for the middle working your way to the edges.
now it should look like this

no bubbles or creases is how you want it.
now carefully trim your film to the headlight it will fold over the straight edges but will be trickier on the curves but you'll work it out.
so it should now look like this no bubbles or creases and neatly fitted to the headlight
repeat the above for the other side and i would recommend to leave it to dry properly for about an hour before driving.
final results
thanks for looking
Dan