TO BLOW SOMEONE'S OWN TRUMPET

TO BLOW SOMEONE'S OWN TRUMPET IS NOT A MUSICAL FACT. WHEN YOU ARE BLOWING YOUR OWN TRUMPET, YOU ARE EXAGGERATING FACTS, INFORMATION, ... ALWAYS TO BENEFIT YOURSELF, TELLING OTHER PEOPLE HOW GOOD AND SUCCESSFUL YOU ARE.
"TO BLOW SOMEONE'S OWN TRUMPET" MEANS ALARDEAR OR PRESUMIR DE SÍ MISMO.

TO BE AS CUNNING AS A FOX:

FOXS ARE VERY CLEVER MAMMALS. WHEN SOMEONE SAYS: YOU ARE AS CUNNING AS A FOX. HE IS REALLY SAING THAT YOU ARE A VERY CLEVER PERSON AND THAT YOU CAN AVOID THE PROBLEMS.
FOXS WANT TO OBTEIN ALL THE FOOD THEY CAN, SO THEY'LL THINK ALL THE POSSIBLE ACTIONS NOT TO BE CAPTURED.

TO BE AS SNUG AS A BUG IN A RUG

WHEN YOU ARE COZY AND CONFORTABLE, IN A SAFE PLACE OR POSITION YOU CAN SAY THAT: YOU ARE AS SNUG AS A BUG IN A RUG.

WHEN YOU WANT TO DEFINE THE WAY A KID IS SLEEPING, YOU CAN SAY THIS IDIOMS TOO, BECAUSE THE KID'S SMALL BODY IN THE BIG BED IS LIKE THE BUG'S SMALL. BODY IN A BIG RUG.

IN SPAIN WE CAN SAY: "ESTAR TAN AGUSTITO".