I reached level 15, grabbed my class quest, and then forgot to finish it before heading into my first Dungeon Satasha.
Which is where I made two very bad mistakes.
The first was that I used the Duty Finder to get into the dungeon. Normally the duty finder is an excellent tool to get groups for dungeons that you need to get done, because it will slap together a group for you across all the servers from all the people willing to do that dungeon, or even high levels doing their low level roulettes and so on, who will be level synced down. This is fine, and nine times out of ten you will get a good group. That last bit was the one that sadly didn’t happen for me for my first run into the dungeons.