My first high end client.

You never get another chance to make a first impression. The fact your shop got the job speaks volumes already! Treat it and him as you would your own and you'll be golden. Mr. High End can turn into an endless stream of his friends and colleagues calling you their mechanic.

I still remember the first high end parts that arrived here years ago for a retired NASCAR driver. Billy, standing behind me when I opened the box, said "Ooooooooooooh, pretty! Don't *uck 'em up." And he walked away.

You'll be fine. Relax, take a deep breath, and fix it right. Then get ready for the onslaught of new customers. :D