You could have got in on youtube for free.
I did it awhile back. I prefer Ripped in 30, it's a bit more challenging but the 30 Day Shred is good for a beginner. I would recommend using as heavy weights as you can. Doesn't matter if you can't finish one of her sets (especially when first beginning a level) because that means you're reaching muscle exhaustion. You will build strength faster if you use challenging weights.
None of these videos are better than having a proper compound exercise routine involving challenging weights/resistance. You'll get faster/better results if you push yourself to muscle fatigue each set in 4-10 reps performing compound exercises like; deadlifts, pull ups, push ups, lunges, squats, rows etc. Most of these videos involve light weights and high reps which is essentially just cardio.