Triggers tips and tricks

So I was designing a map and I needed some help to with triggers: 1- How can I make a villager play the repair or building animation in any area? (for example: the villager stands at the end of the bridge and starts the animation like if he was completing the bridge). 2- How can I change the villager task using the triggers (For example change him into a hunter so he stands holding the bow or change hime into a lumber so he stand in his place holding the axe) Thanks in advance.