To save trim during remodeling, use two small, flat prybars. Slide the thin end of one behind the trim, pull, then insert the second in the space that opens up. Alternate pulling each bar to inch the trim off. If finishing nails protrude from the back, use slip-jaw pliers with a rounded top jaw to pull them through.
A myth of metal roofing is that it is noisy. Metal roofs with solid sheathing and insulation control noise from rain, hail and bad weather just as well as any other roofing material.