got tomorrow off work so going to get somethings done. a got my splitter yesterday which am fairly sure
how to fit it but iv got some rear light tinting spray and am woundering where to start

iv read a need some paint lacquer to put onto the lights before applying the spray, will any do? and will it be best to remove the rear lights to do it?
dude, I would suggest that if you have to ask whether or not you need to remove the lights to spray them then you probably haven't got the skills to be able to tint them properly.
I don't mean that in a derogatory way - but seriously, if you try to spray them in place you'll end up with overspray all over the back of the car, you'll miss bits and (I'm assuming you will be doing it outside) all sorts of cr*p will land in the paint and ruin it.
When I did my Mini lights (on a black Mini) I used a light dusting of black spray paint followed by a few coats of clear lacquer.
You need to be sure because you'll never get the spray off properly afterwards without ruining the lights.
Here's a pic of the Mini lights...
Don't forget, any tint spray will reduce the amount of light your bulbs emit, leaving you more likely to get tugged by Mr Plod...(believe me, I know!)