We reverse our MX5 in the garage (admittedly it's a lot smaller than a Camaro), but it becomes really easy with practice. You get to know where you need to be, real quick.
I also have a Genie laser parking system that fires a little laser beam down onto your dash so you can mark exactly where you park.
Very similar to putting a pencil mark on the wall by your mirror.
Got the parking system off
www.woot.com and paid only $5 for it, so I can't complain!