i agree its dungeoneering, mostly because MOST of the time no one listens to order and when 1 person quits rest do to and when ur about to finish the dungeon everyone quits and all that work gets wasted.........
Construction, first is the start off cost. Secondly other than a good house and some quest req, I have not much motivation to train it because only some items created from construction can be sold to other players. Even then the prices of the items are low cause no one wants to buy them when they can use the gold to buy other items which trains other skills faster.
1. In your opinion, which is the toughest skill to start training?
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I would have to say runecrafting and farming, reason why runecrafting is really repetitive and the xp value per rune crafted is so small, and farming because its a time consuming skill.