I enlarged the painting diagrams from the kit to 1/48 scale, then traced them onto Easy Mask low tack painters tape. Its very low tack which is why you see bits of Tamiya tape on some edges. As Jaime predicted that took about 3 hours.
Here's the Dark Green. I'll need to do some touching up but I'm happy with it. Total time from opening the paint to unmasking about 30 minutes.
BTW all the camo colors I'm using on this build are from my ever dwindling horde of Polly Scale Acrylics.