Hi Jon
Neil's been away so I'll answer your pm questions for you...All supplies available from http://www.handover.co.uk" onclick="window.open(this.href);return false;
1-Shot lettering enamel is what you need....by the looks a tin of Ivory, Black and Dark Green...they are about £6- £12 each depending on colour
get yourself two decent Pure Sable chisel Writers [brushes] a size 4 and a size 8......when painting larger letters try and use as big a brush as poss as the paint flows out and you will pull nicer smooth lines...rather than looking dabbed.
buy a stabilo pencil to help markout [leaves no marks]
we thin the paint with white spirit....we use the consistency of single cream...but probably easier as a novice a bit thicker. Expect to second coat the cream, leave a day before recoating.
Get a large peice of tracing paper and draw you design up....position on vehicle and transfer onto bus by charcoaling the back and drawing over with pen...this will get it the same both sides.
As a beginner do one colour a day....then if you have to wipe back you won't wipe off what you've already done.
clean brushes with white spirit..then grease with oil, vaseline or neatfoot,....before using again clean thoroughly with white spirit again..or paint will fish-eye.
degrease bus with meths before starting
leave a week before fatiguing..and t2d are the experts on that
good luck