I tinted my Focus first with 35% and felt meh with it. It's not quite dark enough in some cases as you can see in some of the pictures up there. So then stupid me goes along and tint my Crown Vic with 35%
Same issue but better.
Now I know though. No more 35 for me.
I was afraid to screw up the headlights as I tend to royally f things up when I shouldnt so I sent them off for a shop to do it and I don't think it was that difficult for them.. I had them back in a about a week