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Instead of using plywood, consider using wonderboard (concrete backer board...also goes under the name greenboard, etc.) It's a concrete board that will flex and give less, thus providing a more stable surface for the tiles. (Less chance of cracking)
You may want to buy some spacers if you're not confident that you can space the grout lines perfectly yourself. They help to keep your tiles spaced evenly and make the job look that much better when done...
Good luck to ya.
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