For the snake boss, it's incredibly easy if you simply sit the DPS at the top of the ramp by the zone-in and then pull him all the way up top. The snake spawns will take a really long time to make it up there. You'll have him sub 50% before the first snake finds its way up to you. The snakes still come, though, and they are hard to get aggro on over the healer using this method, so if you do it this way make sure you burn him down and pop heroism and trinkets early.