* it isn't blowing and making bottles
Idiom used here and there by Almost Everyone
It means that something isn't easy.
"Acabamos de poner un local pero no nos está yendo tan bien." "Bueno, no es soplar y hacer botellas. ¿Qué pretendías?"
"We just opened a store but we're not doing so well." "Well, it isn't blowing and making bottles, what did you expect?"
9 out of 14 Spanish, Castilian speakers have heard this