This is the part where I wish I had done this a week or two ago. While training one of the vines, I snapped off the growing tip. It's not the end of the world as far as this vine is concerned as the lack of Auxins in the dominant tip will cause the vine to sprout a new one. I used insulated copper wire to loosely tie the vines to the wire mesh. They'll eventually hold on by themselves but for now, this works as a good suggestion.
Try not to break stems. They tend to be brittle in older plants. If all the leaves aren't facing towards the sun, don't worry. Phototropism will fix that in a few days. Maturing fruit will need additional support if it develops on the trellis. Fortunately since I have an existing structure behind my trellis--I can easily attach slings to support fruit. If it develops on the roof, you win!