Easy
A couch patato
To have a lot on your plate
To be very busy
To beat around the bush
To discuss a matter or a problem without coming to the point
A walk in the park / A piece of cake
Something easy
To leave a lot to be desired
There's still something to work on
To take a rain
To politely decline an invitation and postpone it
Not my cup of tea
Not something I really like
Once in a blue moon
Rarely
A double-edged sword
Smth that has both benefits and drawbacks
To cost an arm and a leg
To be very expensive
To play it by ear
To improvise
All that and a bag of chips
Amazing, brilliant, great
Out of the blue
Suddenly, when nobody expected
A cutting-edge
Modern
A close call
Something bad that almost happened