Having had to arrange funerals for both of my parents, the only thing that I knew was that they wanted to be cremated. Hymns, venue, flowers etc we had to guess on.
In fact, for my father's funeral, we really upset one of my aunts, to the point that she didn't speak to me until she died !
Dad wasn't a church goer and wasn't impressed with the local vicar, so we just had a service at the crem - that was wrong because my dad used to go to church as a child, so we should have had a church service, and the hearse we chose, knowing dads lifelong love of motorcycles in all shapes and forms, we chose a motorbike and sidecar - aunt's reaction I found out earlier was "If I known THAT was going to happen I wouldn't have come!!"
I think you family will be very pleased if you put plans in place - my sister's in laws had also pre paid and planned out their funeral - venue, hymns, music, burial/cremation , so that is an alternative.
Believe me , at one of the worst times in your life, when you have so much to deal with, knowing it is what the deceased wanted, makes life so much easier for those left behind.