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OG guide was way too intimidating for me. It's an 2 inch+ thick book with text everywhere. I would not start with the OG guide. You can use it for practice after understanding the structure of the exam.
Mastering the GMAT is not about solving math and verbal questions (math type people like me who like to solve problems methodically finds it very infuriating, because you run out of time easily doing so). It is about mastering the basic structure of the exam (type of questions: data sufficiency, etc.) and the underlying skills they are trying to test you (making rationalized decision with limited time). Most guide will teach you the basics of these two. To master it and get a high score (high 600 to 700+), you will have to practice over and over again.
I suggests trying out multiple prep tools before committing. Everyone's learning style is different. Most will let you trial for a few days or sessions.
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