Ideally you will have an opportunity to try out your best man speech a few times before the big day. Its probably a good idea to find an audience who won't be at the wedding such as a college or family member. If you are nervous about public speaking try to arrange a practice with a group rather than a single person because this makes a big difference.

If you are thinking of including some jokes in your speech, make sure it's appropriate and suits the couple. Good and timely jokes could make best man speeches humorous and thus engaging, on the other hand lame and over-used jokes could easily break your speech. So, be careful with jokes. Rely on your natural sense of humor rather than being desperate to make a hilarious best man's speech. Sharing a few funny anecdotes would be an excellent idea. Think of a few moments of fun and laughter the two of you (the groom and you) had shared in the past - these are what you need to make use of in order to full off funny best man speeches.