I thought I'd have a go at putting the tail markings on some of the 109's and take a few photos of the process while I was at it. I don't claim this to be the "right" way to apply decals, it's just the way that works for me.
On saving grace is at 1/600 scale it doesn't matter if a decal isn't exactly in the right spot. If it looks like it's in the right spot then it is in the right spot.
So now onto my next fiddly project: propellers.