I can't imagine what to say to you right now, because if this were me i'd probably throw myself onto the little coffin and sob loudly the whole way through her service. My only words of advice would be to just do whatever feels 'right' for you and DP. Clutch his hand tight. Perhaps taking a photo of Hayley to hold and then when it gets too much look at her. I'll be thinking of you on Saturday, as I do everyday.
xx