While many virgins look forward to having sex, the truth is almost everyone worries their first time. I know I was. The truth is people have been having sex forever, and every person who does has to have a first time. So, my best advice is don't force it, and don't think about it. If your future husband is as understanding as you say, then just let him know that you want to be married to him, but you don't want to promise sex on your wedding night. Weddings are SO STRESSFUL as it is, to pile your first time on top of that just is a recipe for a disaster. Once you give yourself permission to go that far, you will probably be surprised how quickly you get to that point. Spend your wedding night in bed together, in pajamas. Just kiss, caress, etc, then sleep. That will help build intimacy. After a few days or weeks, chances are you will go further and one day it will just happen. Just have lubrication on hand and everything will happen as it does.
One thing I recommend: DO NOT RESEARCH SEX! Dont look for the "right" or "best" way to do it. Don't look for the things that can go wrong. Just trust yourselves for it all to work when you are ready (assuming you know the basic mechanics of it).