* No caffeine - it makes you more jumpy, more anxious.
* No heroin - talk too slow
* Practice 10-20 times going through the whole thing
* Practice doing the first paragraph 50-100 times - nothing derails a speech more than a stumble at the beginning.
* Practice acting comfortable - don't just read/deliver
* Alcohol - you need to be prepared here. Some people are more fluid (ahem...) with a drink while it messes other people up. Decide prior to attending the wedding what your plan is
* Flirt with the pretty girls with your eyes. I find that I can maintain that "randomness" factor of scanning and including the whole audience if I look for the hotties and then make eye contact. It also makes me more comfortable looking at pretty girls than men or women twice my age.
* Look your best - confidence comes from looking good and feeling good. The "looking good" should be easy - you're in a suit - and the "feeling good" should come from the fact that you are prepared due to all of your practice.
Good luck!
Caffeine calms some people down. Lack of it can throw people off, make them edgy.
Better to just not change your usual habits unless you really know how you'll respond.
Practicing really makes a difference. I've tried, though, to be sure I know the points I want to make more so than the specific words, and when rehearsing try to see if some phrasing work better than others (and try to keep) them.
There's no substitute for actually doing it.
My tip would be to use stories/anecdotes, especially for something meant to be entertaining (vs. informative) for a best-man's speech. Think of some funny memories that can be linked together to give insights into the personality of the groom.
1. Everyone who comes speaks to the entire group for 1 or 2 minutes. This was called "Table Topics". A different member is assigned each week to administer the Table Topics. I remember one time the Table Topics person handed each one of us a paper bag that we had to open, remove the object inside, and give an interesting talk. My object was a clothes pin.
2. Everyone gets a mentor when they join to help them through the education.
3. Everyone cycles through the program at their own pace giving longer and longer prepared talks. 5:00, 10:00, 15:00, etc. You give one of these every month or so.
4. Every single talk is publicly critiqued by at least one judge. They are usually ruthless and very, very helpful. It took me months to stop playing with my hands when I talked. They finally got me to stop.
5. I remembered speaking about my business in all my prepared talks. I can't imagine having a better place to practice than Toastmasters.
For a best-man toast, maybe it's to make people laugh, foster warm feelings towards the groom/couple, keep the party moving, whatever.
For other speeches, it might be sales, or passing on information, or political persuasion.
But know what it is you want to accomplish and plan the length, topic, style, etc. around that.
It will seem slow to you, but it will sound normal to the audience.
Also, agree with the others that there is no substitute for actually doing it.
One thing you might try is videoing yourself giving a speech. Then watch the video and see what you like, what you don't like, what is effective, etc.
Good luck!
It makes you more relaxed, less hyper.
But something to keep in mind is that even if you can't see people you need to occasionally direct your attention to those in the back or up in the balcony so they don't feel ignored and tune out.
Also, assume that the audience is on your side and want to like you.
I bet the crowd size wouldn't have mattered. Last two times I gave a talk to any sizable crowd the lights were such that it was sort of hard to really see past a few rows.
Now, had the crowd gotten unruly, yeah, big mobs are worse than small mobs and you find out soon enough :)
Hold your hands behind your back as you face the audience just before you start.
Clench your hands into fists as tight as you can while also clenching up your butt.
Hold that pose and your breath for a few seconds and then relax and breath out.
Anyone facing you will not be able to tell what you're doing if you just clench your stress in your fists and your butt until you release it.
You won't use the written version when you actually give the talk, but you will be 10x more confident.
Don't.