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It's pretty impossible to wreck your game with a mesh mod
A save possibly, but not the whole game. And even if you did, you could reinstall it.
If you've never done ANY kind of CC before, though, I would start with something simpler and better understood than mesh modding. The very first object mesh mods for sims 3 have only started to come out in the last couple of weeks; there are still many unanswered questions, and not very many tuts. You might want to start with a recolor, which would teach you how to use the cloner and the package editor, or hair or clothing.
Whatever project you choose, you can expect plenty of trial and error
Don't be afraid to make mistakes!