you've already started doing what I didn't...plan I ended up writing most of my speech the morning before the wedding and putting the finishing touches on it in the church during pictures, I knew what I wanted to say I just didn't like the way it was worded and pieced together it ended up going good but another piece of advice, don't read off paper, and if you have to, type it up, I lost my place on my hand written note and muttered "crap" in front of 450 people when I got lost in the editing I had done, everyone laughed which helped I guess