you usually go to the salon for this procedure and the stylist will section you hair to create rows, on each corn row, human hair extensions are sewn onto selected strands of your own hair using a needle, close by the scalp. Your hair strand will generally be pulled quite tight to get a good fixture, so this can be quite uncomfortable. This method of attaching hair extensions is often preferred due to the fact that there are no chemicals used. The hair extensions will need to be regularly checked for looseness, and re tighten as necessary.