Hi Readyandwaiting,
I followed the baby whisperer book, from when DD was 10 months, and it worked for us, but took a long time, so don't expect too much too soon.
However, it did work for poos straightaway (no more dirty nappies - hooray!), so if this is what you want to focus on, then I definitely recommend it.
If you follow her guidance strictly, then it involves putting baby on the potty when they wake up, 20 mins after a meal/drink (or whenever they usually go if you are already aware of this), before/after naps, before bath etc. You sit them for no more than a few minutes, and if they do something in the potty, then you go overboard with praise. After a while they may start to signal when they need to go, or keep dry/clean in between. Once they've been dry/clean for a week or 2, you can safely put them into pants, although this didn't happen to us so we just made the transition to pants at 16 months.
Our DD still wears nappies for naps/bed but is dry/clean when awake, and she's just 2. We had a few relapses, and we didn't follow the book closely all the time (we used nappies/pullups when we really didn't want to deal with accidents such as on long car journeys or at friends houses) which was probably confusing for DD. Our DD also attended nursery part-time and at around 12 months, we asked if they could put her on the potty, and they were happy to, although not as frequently as we did at home. Worth a go. Ideally you need consistency, but we got there in the end!
Best not to start if DS is not well or if there are any other big changes in the household. Good luck!