Ladies and gentlemen, it is my great honor... I am so pleased... It is... Don't start an introduction speech like that. It's not about you. It's about the person you're introducing.
The key to giving a good introduction is you want to be relatively brief. You want to give the information the audience needs in order to know why they should care about this speaker. And you want to give the most interesting information about the speaker to wet the appetite for the audience.
And don't make it about you. It's not a great honor for you. Maybe it is, but your audience doesn't care. You may be just the only person willing to do it. Do it with a spotlight of focus on the person you're introducing, not you.
And try to weave in a little flavor. If you have a personal story that's brief and isn't about you that paints a picture of the person you're introducing, that's great. If you want to ask someone else what they like about this person the most, or why an audience member is so excited about hearing this speaker, weave that in.
But be brief. People are there to hear the speaker, not you.