So sorry for your loss, and what a brave and beautiful thing to do. I think, from a delivery point of view, familiarity with the content is normally the best antidote to emotional attachment – rehearse, rehearse, rehearse. But what you’re doing is a long, long way from normal, and I think it’s fair to acknowledge that the emotional link is going to be impossible to break. I would want to do it as cleanly as possible too, so I would find myself a place on my own to go read it out over and again, but I would also be prepared to accept that emotion that raw isn’t something you can just rub out with a bit of practice (nor should you necessarily want to) – even if you can read it out to an empty room today, it will be far more intense tomorrow.
Prepare to do your best. But be prepared for it not to go as you’d hope, and don’t in any way be fearful of that either – you will be amongst people who love you both and who will be supportive no matter how it turns out. I’ll be thinking of you all tomorrow.