But Beans, your opinion about what path is the right path is your own opinion. People can make a great career in magic without picking up a single book about magic. There is enough content out there in the video format that any person interested in magic, working professional, etc. can be a very successful magician. It's a different world we live in now, many things are video based now. Training at work now usually consists of videos and literature, if not that fully video depending on the job. It is still true that some training consists of only reading, but that is usually supplemented with hands on training. Nothing beats hands on training whether it have an intro through video or written word.
In theory the measure of success in a magician isn't whether they start with dvds or books, it is their ability to learn through doing and performing that is the key factor. Personally, if the original poster wants to start with Drawing Room Deceptions, I don't see any problem with that. It's going to be tough because it is a tough book to try and swallow right out of the gates. But if they stick to it and continue practicing what is in the book and whatever effects or sleights they already know, they will only gain more technical knowledge. The one's who struggle through life, learn more then those who don't.
There is no right or wrong in magic, that is why it is a profession with very different and unique performers out there. A strong foundation is key, and if they already have that, who is to say that taking on advanced technique isn't the right way to go? There are no rigid game plans past a foundation in magic, whether that be a single card trick taught by your uncle or an effect learned from a magic book found in a library. As long as the person has an actual drive and wants to learn more about magic, they will find what they seek. Magic is sheltered behind closed doors. However those doors aren't locked and if one would only turn the knob of the door and open it, they will be rewarded with a wealth of knowledge and secrets of magicians.