I believe it would be for the best if we could write in-game guides for dungeons/trials etc. that would pop up whenever you enter DF queue for something.
The feature should look like mini forum for each instance, with reasonable character limit and possibility to thumb up the best guides.
In my opinion this would significantly decrease failed runs due to lack of knowledge.
These guides could be server based and to motivate players to write them writers could be rewarded a title "The Guide" for enough thumb ups.