Just to explain the glue pulling technique. With some dents it is not possible to access the panel from the inside so a small round tab is used.
A small spot of special glue is put on the tab and the tab is placed on the dent. A slide hammer is used to pull the tab which then pulls the dent out without damaging the paint . This works only on cars that have not been respraye as those cars run the slight risk of pulling paint off.