To be able to deliver the perfect speech and have balance you need format in your speech, break it down into sections.

The introduction - Keep it straightforward, simple and to the point, get all your thanks out of the way

You and the groom - a brief history of you and the groom and your relationship, not only your friendship with the groom but his family too.

The day the bride and groom met - That fateful day when the bride and grooms eyes met across a dry ice filled dance floor and the fact that she was drinking pints of snake bite he knew she was the one for him.  You can be sure that not everyone will know how the couple met.

Take the piss out of the groom time - Time to take have the groom sweating and worried about what you may say, remember though keep it light and funny, don't insult him or go to far into 'what a lad' he used to be and how he shagged half of England, Scotland and Wales before settling down with the battle axe in the white, and how it breaks your heart as he was the best wing man you ever had, even on the stag do!

Make him loveable and endearing not a pint swilling, tab smoking cock on legs that bangs anything that moves.

How the groom has changed, for the good - This part is designed to describe how that loveable rouge drifted through life with no purpose or meaning until he met the bride, and now his life is now complete, perfect for getting out of any holes you may have dug earlier.

Cheers, raise your glasses - End the speech with a toast to the couple and their new life together, mean it, even if you do think she spends more time on her back than li lo lil.