At BA we are not supposed to open them from the outside either. Infact I have not been shown how to open the 767 or 777 doors although for some reason someone did talk us through the opening of the 747 ones from outside. Now if it was pouring down with rain I do not think I would hesitate in teaching myself but otherwise I would wait until the correct people come along. Afterall, our job is to get people OUT of an aircraft in an emergency...Not into them!!!!