Struggling is the name of the game in S02E09 Bitter Work. Lead by Nicole, we watch as Aang struggles with his complete opposite mentality and element--earthbending, see Toph struggle to get Twinkle Toes to plant his feet flat on the ground, Katara trying to help Aang but making it worse, Zuko struggling with his inner demons and denial of said demons, Uncle in guiding Zuko, Sokka between a rock and hard place, and Foo Foo Cuddlypoops being TOO DANG CUTE. The struggle is real, y'all. But you gotta do the bitter work to get those sweet, sweet victories. 
[Pod Sing Se is a spoilery weekly Avatar: The Last Airbender rewatch podcast hosted by Jen, Nicole, Steph, and Abby. This episode was edited by Jen.]