In order to put in hair extensions it would depend on the type of extension that you are using. For wefted weaves the tools you would generally need is hair glue or a hair needle and hair sewing thread. In order to use the glue you must part the hair in small sections then put the hair glue onto the wefted area of the extension, place the extension onto the open scalp of the parted hair, wait for it to dry, and continue. For sewing hair extensions you must first braid the hair into need cornrows and sew the wefted area of the extension onto the cornrows. Other typical ways of putting in hair extensions is braiding loose hair into the natural hair and also fusion. For a more detailed description of how these methods are usd please contact your local cosmetologist.