This guide will provide you with the fastest and least expensive way to level your Skinning skill up from 1 to 600. The guide is up to date for WoW patch 5.0.5
In this guide you will find the routes to follow to level up your skill as quickly as possible. The only profession that works with Skinning is Leatherworking.
You should know that even if a mob is red/orange to you, that this does not guarantee that you'll get a skill up. There is a good chance but it is not 100% certain.
Note, because of the nature of this profession, you should know that this guide is first and foremost a zone guide. In it you will find which zones to go to in each level to up your Skinning as quickly as possible.