I've a couple of those transfer sheets and some Italian ones and I must admit I take advantage of them not being printed as individual "squiggles".
These are the Print Scale ones so I assumed they were a single sheet. So I mocked up a template of a wing, carefully cut it out from the decal sheet and placed it in water. Turned my back and when I looked again a dish full of individual squiggles. (Please place appropriate swear word here _________ ). If you look carefully on one wing I've got a nice straight line using masking tape and a sharp knife. On the other I couldn't be bothered !
Fuselage was easier to do (larger blobs rather than squiggles - easier option) Some have overlapped but you can't tell. Tried t get a wavy line ... it sort of worked.