I've been trying to brush-paint a resin 1/144 scale AEC Dorchester armoured command vehicle in the hard-edged geometrical Caunter scheme. On a larger scale model this probably wouldn't present any major problems - you'd just mask the model and get nice, crisp, straight divisions between camouflage colours.
At this small scale, however, all the detail (antenna bases, rolled-up tent, etc.) is molded onto the hull, thus making masking pretty much impossible. I have tried brushing the pattern on free-handedly, but of course the divisions are anything but crisp, straight, geometric, etc., i.e. the paintjob lacks all the defining qualities of the Caunter scheme (apart form the colours which I think I got reasonably close).
Is there some trick, or is it just a matter of practice, practice, and then some practice?