Hey LP,
If you can bend it by hand, you can wire it. If you can't bend it by hand you can still wire it, but it becomes more technical. Cedars are really really bendy, so they can be wired with fantastic success, BUT, as Bodhi says, they do take a long time to set. They also swell very quickly in the growing season, so I'll put money on it that you'll end up with some wire bite!

If you wire them, wire them loosely particularly at this time of year. This means using thicker wire as well. Finally, when you eventually take the wire off, they have a habit of relaxing any bends you've put into them, so wire into a shape that is a bit exaggerated, and then the tree will end up where you want it. Anther thing you can try is to cut the branch you want to wire at the back of bends (out of sight)(a cut running along the length of the branch with something like a scalpel of sharp blade). The scar healing process can add strength to branches ability to hold a new position. Of course, you'll need to make these cuts before you wire, so you'll need a plan.
Check out this link where Bodhi started with a tree of his and I follow thanks to inspiration from his post. It has some good info.
viewtopic.php?f=104&t=7742&hilit=bending+cedar
Cheers,
Andrew