I am the best man of my buddies wedding this coming weekend...and i too have to give aspeech...I am nervouse...but after a few beers (not too many...something to cool my nerves)....I am just going to wing it....speak from the heart....I will try to say funny things but I am most likely going to keep it short and sweet....best sides he is marrying my cousin...so i can't say too much.

Just do what those said above...take some notes and then speak from the heart.