This is probably a pretty stupid question but I was curious when it asks for the length you want the piece if your always suppose to order longer so you have more room to cut in??? OR if you want to order the length you want your piece to end up. For example I want my hair to be around 3-4 inches. Would I order 6 inches and cut it down to 3? Im sorry if this makes no sense at all I just never really thought about the length system before. Any info would be greatly appreciated