If you've never used PE before, then I'd reconsider a couple of things...first, try a smaller project if you're using PE for the first time...I would suggest a Tamiya Fletcher in 1/350.
Also, White Ensign makes INCREDIBLE photoetched sets, but I warn you now they are not for the inexperienced modeler. They are very thin, complex, and delicate. The WEM set for the Yamato is perhaps one of the best PE sets ever released, and it's also one of the most advanced you can apply to a model.
With a ship the size of Yamato, you're simply inviting disaster if you haven't worked with PE before.
Gold Medal Models makes a PE set for Yamato, and Tom's Modelworks is working on a basic detail set. I also believe that Eduard does a set, but I think it's in stainless, tougher to work with, but alot easier for inexperienced modelers with big thumbs.
Jeff Herne