An eyelid correction usually takes between one and two hours, depending on the extent of the operative intervention. For correction of all four lids, the plastic surgeon normally carries out the upper lid correction first. In a typical operative procedure, the surgeon places the skin incisions in the natural skin folds of the lids: on the upper lid in the lid crease line, on the lower lid directly under the eyelashes. In the case of a large surplus of skin, the incision lines can extend into the crowsfeet or laugh lines on the outer corner of the eye. Your surgeon has access through these incisions to the muscles and underlying fatty tissue where surplus is to be removed.
After this, the surplus muscle tissue and skin is removed. The skin itself is closed with fine sutures. 
If your problem on the lower lid is less a matter of excess skin, but rather relating to tear sacs, a “transconjunctival blepharoplasty” can be carried out.
For this operative procedure the incision is made inside the lower lid, resulting in an invisible scar.
In this case there is no surplus skin to be removed and, following transconjunctival removal of the lower lid fat pockets, the skin can return into position elastically.
This procedure is primarily selected for younger patients with thicker, more elastic skin.

Eyelid correction is normally carried out under local anaesthesia of the skin around the eyes.
In the event that you are extremely nervous, an oral or intravenous tranquiliser can help. You will remain conscious throughout the entire operation, but be relaxed and will not feel any pain. Nevertheless, you may feel slight pressure or pulling, however this is not painful.