The most technically demanding aspect of this arrangement is the control of the individual voices.
It is a good idea to study the score away from your guitar and grab a pencil and mark in any inner voices that you feel may need specific attention. If you are not aware of these elements, you will miss a vital opportunity to hone your ear as well as your general technique.
Also, it is well worth isolating these voices and playing them independently from the rest of the music. This will help you to maintain your general awareness.