What can I do to make my wedding night less painful?

I am a twenty five year old virgin and my husband to be is also a virgin. I am worried about our wedding night because he seems rather large to me. I am not sure what is the average size of a guy but one day we measured it out of curiosity and he is about 7 inches long and 6 inches around when fully erect. It seems very big to me. I am so worried that his size will make our wedding night very painful! I still have my hymen and can't even get all the way through a pap smear! I have been waiting my whole life to have sex and I want it to be worth the wait, not traumatizing! So, I guess my question is.. How can I make my wedding night less painful? Is there any special trick to opening up more down there? Any tips on this are greatly appreciated! Thanks!