You will feel more comfortable and won't get intimidated by more advanced practitioners performing difficult postures easily and elegantly. If that's not possible, make sure that there are enough beginner classes scheduled during the times that you can attend. Most people start with a group class because of the cost and the boost in motivation that comes with practicing in a group. If you can afford private lessons, however, even a few can be extremely helpful, because you get personalized attention. It's entirely up to you which route you want to take.
Books are a good choice.
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