Fastening aluminum fascia to wooden subfascia
Fascia wraps should only be nailed on the bottom (horizontal) face if possible. Avoid nailing the vertical face except where the run terminates if you have a gap, and then use a single nail. Dimples in the vertical face are very difficult to avoid and show conspicuously in certain lighting conditions. 

Most carpenters don't pre-drill, but it can be difficult to penetrate the metal if you're not skilled in upside-down nailing. Feel free to do so. You might even do it on the ground beforehand. Aim for the center of the face and every 16" to 24" or so. 

Be sure to use corrosion-resistant nails in a matching color. Drive them just far enough to pull the wrap into position. When working with finish metal, gentle is the name of the game.