There's no way to take the emotion out of it, nor should you, but if I can offer any advice it's these things:
1. Practice the speech 4 times. Each time you feel like you are about to breakdown, pause, breathe in and out slowly, and continue. Don't pause too long.
2. Don't make prolonged eye contact with family or friends in the front few rows. This will allow you to not reflect too much on their emotional reaction to the speech, which will cause more emotions in you. Look towards the back where you are still looking at everyone there, but are more likely to find a less emotional face.
3. Pray for strength. I'm not sure if you believe in God or not, but if you do, pray for strength to deliver the speech. Pray for comfort and peace.
That's about the best advice I can give. I did those things at my Grandmother's funeral when I was in my early 20s and managed to get through it. I'll be praying for you and your family.
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