I had a major issue stringing up lights this year. Normally my DH does it but he has been at work every day for the last month. Well when i got to the last strand i had it backwards and ended it with a female plug..... So I couldnt plug it into the wall. This was discovered after about half the ornaments were up..... to solve this issue my FIL cut off the female plug and rewire it with a male plug.