Question about harmony books

[countrymath]

Hey people...

Ive been studying Walter Priston's "Harmony" for about 2 months, but its a hell difficult to do it by myself.

Does anyone know this other book, called "Harmony and Voice Leading" by Edward Aldwell?

Link on amazon: https://www.amazon.com/Harmony-Voice-Leading-Edward-Aldwell/dp/0495189758/ref=sr_1_10?s=books&ie=UTF8&qid=1307753130&sr=1-10

The reviews looks promising.

Basically what I want is to learn how to make an orchestral arrangement, so I need to know how to make chord progressions and voice leadings.