The difficulty of learning a new instrument is based on a couple of factors. The first is how familiar you are with different musical concepts, such as reading music, chords, scales, and notes. If you are a complete beginner, then it will be easier for you if you get some instructional materials.
Luckily, sever different digital pianos come with DVDs or books. One such model, the Casio Privia PX-160, comes with a DVD and a book. This should help make learning the piano a whole lot easier and more enjoyable from the outset. Setting up a digital piano is quite simple. All you need to do is plug it in and arrange the setting by following the user guide, after which you will be good to go.