Someone fairly new to C++ will find making the code samples into a working project quite tough. Although I would say it was not too tough.
For example the Asteroids, Tetris and real-time multi-player tower defence game were straight-forward enough to get playing.
The strength of this book is really in it's sheer variety of projects(blueprints). If you want a really convincing SFML patterns guide maybe research SFML Game Development
. If you want to build multiple working games packed full of the different SFML module's functionality then I have to say this book was seriously fun.
Tetris with box2d is a hilarious but really useful project.