Not much to add really that hasnt already been covered
+1 keep something in your pocket that had a meaning , it should help
Funerals are a roller coaster of emotions. Plunging lows and deep despair , and feeling elated by the kindness shown by others on the day , meeting with people whom you may not have seen so much recently , to quiet solitude and reflection
This I do know. After the ceremony a great weight will be lifted and you will feel a release from the worry of not looking making a complete tool of yourself , which is ok and everyone will understand, and you can share memories with friends and family.
and dont get hammered , it never ends well.