If you elect to add superscript notations to the Gospel that you have pasted onto your template, then you will have already composed the music once. When you write the notes afterwards, you'll have the opportunity to make refinements if you wish.
Over a period of time your Gospels will improve so that you may have disdain over what you wrote a year ago. This is a work in progress for me.
Likewise you will probably sense your delivery getting better, including to choose your breathing points.
I am blessed with a big church to fill with sound. It has no PA system, so it provides opportunities to develop some voice power. If you wear a microphone, I recommend turning its gain down a bit so you can cut loose and enjoy without overwhelming your congregation.