Easiest way to level blacksmithing, woodworking and clothier is to deconstruct everything you get. As a general rule you get more inspiration from deconstructing than crafting. You also get more inspiration form deconstructing higher quality gear (green, blue, purple) than low quality (white). Pieces with intricate trait gives you bonus experience and also more materials when you deconstruct them. White gear that is found in the world or containers gives you neither inspiration nor materials, unless it's stolen; stolen pieces give you just 1 material each. Crafting writs give inspiration, as does finishing research for a trait. Most items are worth less than the materials you can get by deconstructing them (on guild stores). Only pieces that are part of sets, have good traits and are maximum level are worth saving. Ornate pieces are better sold to NPCs than deconstructed. So go on and break almost everything you get. I have been able to reach 35-40 in all 3 skills just questing trough the alliance areas and deconstructing everything I got from enemies and quests.

30 CP invested in the Tower Tree will unlock 20% crafting (Inspiration) experience bonus.