While your loved one was alive you never needed to dig down deep to explain to people just what they were like. A eulogy poem is a special form of prose written to offer comfort to the bereaved.
Arranging the funeral, including the funeral music, is simply a matter of setting into motion those choices. It will contain highlights, perhaps about the deceased's schooling and work careers, but definitely something about their families. If your family is part of a religious community and the deceased would have wanted a religious service then you can look to your minister, rabbi, or priest to help guide you through making arrangements.
Many times we just don't know how to realize that they are home, home with God. Some people actually find it easier to stick to a theme, during the writing process, making it a bit easier for the words to flow. While it's probably not wise to crack jokes, a little humor will help to lift the spirits of those attending the services.
And it doesn't end after death. If you find it hard to think of moving things to say, you may want to look at various sources for inspiration or short quotes to include in your speech.
