Does anyone know of a skill guide that describes each skill, how to gain each skill, and which professions complement which skill?
Check the Guides Section of the forum… You can find plenty of info here… If someone starts to speak about every -single Skill and it’s asociation with actions … he/she’ll need like .. a week! 
Try this link you might take a good idea about skills. :wise:
Just Find in the left the “skill” link.. all the rest is obvious. Hope that helps.
http://candyman.se/pe/skillschart/
Noone knows what each skill really does except MA.