I would most certainly attempt the vegan diet first. Before I tried the raw diet I had already been vegan for a few years. I don't think I would have done well if I wasn't a vegan first.
To another person: Tea isn't considered raw (because the hot water would bring the herbs above 160 degrees), however, I know many people who failed to see the downfall in drinking hot tea on a raw diet. I did, and I think it was nice to have something warm once in a while, especially when living in a very cold climate.