Hi Yvonne,
Great news: nipple reconstruction is not painful and you've already been through the more difficult parts of breast reconstruction!
Nipple reconstruction is done through "surgical origami" - your surgeon will rearrange the skin to make a protruding nipple. Before the surgery it is necessary to work out where to place the nipple on the breast, so that symmetry and breast aesthetics are achieved. If you have had reconstruction with a TRAM or DIEP flap then the area of skin that is operated on usually does not feel pain, so you will not feel the usual sting of the local anaesthetic that is used.
Tattooing is performed to achieve a coloured areola and nipple, again aiming for symmetry and ideal aesthetics. A number of different tattoo pigments are used, so that the colouring looks natural, and the edge of the areola is blurred (like a natural areola - which is a blurry line, not one drawn on with a pencil or texta).
Sometimes a skin graft is used in nipple reconstruction. If this is the technique that your surgeon uses then an another small area of skin (for example, your abdomen or groin) will also be numbed with local anaesthetic for the procedure. After the skin graft is taken this area is stitched closed and a waterproof dressing applied to the area.
As there are variations in the types of nipple reconstructions performed by different surgeons I recommend that you ask your surgeon to explain his or her technique, as it may differ slightly from what has been described on this page.
Good luck!