Is it hard to learn butterfly. I know the rest of the other strokes d .....only butterfly.

recently start learning freestyle (self learning) by watching youtube...
been practicing kicking with kickboard and wow ... not moving ..

not sure whether is possible to self learn freestyle, cause some of my friend say better get a instructor..

hmmm ......

ps : btw used to swim breast stoke 

for swimmers, how do you guys improve and increase lung capacity? running out of breath after a few strokes for my freestyle.

I am very happy with today swimming lesson!
Because I finally can do a powerful dolphin kick!! Previously all dead fish kick or machine fish kick, not moving forward at all. So fed up with my stiff body.
Then suddenly today i finally catch the wave of the water, and  I move my body along. I make sure my head motion is minimum so it is my lower body that provides most of the propulsion.
That sounds of kick cannot forget it. That is the most powerful dolphin kick I ever performed. Finally can feel how is it like to be like a fish.
Now I need to synchronize my newly acquires dolphin kick technique with my arm pulling, then I can fly like a butterfly. Can't wait that day to arrive.

quick question:

i can swim normal pool ( not taller than my height) and i am trying to swim deep pool but there is a fear there and i dont know how to stand swim yet

so does anyone take classes to learn stand swimming or you just learn yourself in deep pool