With a little forethought you can cover the whole wing length with one piece. Start covering at the root and leave the last 6 inches or so of the wing unattached. Leave enough covering at the leading and training edge to be able to grab and pull. Break out the heat gun, and pull on the covering right at the wingtip while blowing heat from the tip inwards. You're looking to heat the covering for the first 4-6 inches from the wingtip so that it will shrink and stretch to go around the compound curve. Go all the way around the wingtip using no more heat that is necessary to get the covering tight, then do the same to the LE and TE to get the linear wrinkles out and pull the covering tight. If you haven't used too much heat, any wrinkles that remain will shrink right out when you go over the wing after the covering is complete.