Yes that is one option.
Also you can do a Automatic mapping and then go into the UV Editor and arrange the UV's.
The problem you will get with doing each face on its own will be with matching each planer map.
Chris (formerly R@nSiD)
When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)