I have been following horde guide and so far been doing great. Just finished Stonetalon Mountains (20-21) with some XP in level 21. But the next guide is The Barrens (22-23) and almost at the beginning of guide it asks me to go do some level 24-25 quests that are very difficult to do as a level 21. Looks like there is something missing in between those 2 guides…
the stonetalon guide was supposed to be 20-22, and you really need need to grind to level 22 first. while the quest is labeled as 24 they are quite easy to do and you should be able to complete at 22, only the named mobs are level 24-25 while regular mobs around the area are mostly 22-23