It's a very good guide for those who are entering Buddhist meditation. Clear, precise, it tells you what you need. It cannot substitute the personal presence of a teacher (lama/guru), though. Some pieces of advice: 1 before going to vipassana, analytic meditation, do a lot of samadhi, calming meditation.
With "a lot" I mean several months, 20 min once per day. Samadhi is essential. Without good concentration you would just do bad vipassana. 2 the concept of karma is hard to accept to the Western mind, as the idea of previous and future lives. If you cannot accept these concepts, you'll never be a Buddhist, but you can anyway reap many of the benefits of meditation. You can do vipassana on emptiness, appreciation, impermanence, and death awareness without being a Buddhist and already change the shape of your mind quite substantially. Meditation is a powerful technique and it can revoluzionize one's life. However, it is very slow and takes time and patience. Remember that already the effort of sitting on a mat to try to meditate is a great achievement! Do not feel frustrated - it's slow - it takes time.