tinting is alot harder in my opinion well unless the tint film has changed in recent years windows need to be ubber clean, and its a b*tch getting the air bubles out, side windows should be easy the rears are always nearly a pita to do due to the size and curves but there is alot of black border on the rear zed window to lose the bubbles in, back in the day when tinting by hand the back always used to be done in 2 or more strips and you loose the join in the heating elements, i havent actually done it on a zed as mine came tinted so may be easier than the old cars i used to do it on and the tinting film may be better these days to