to do something blindfold

to do something by a wangle

to do something by numbers

to do something for a living

to do something ad nauseam

to do something till one is blue in the face

to do something for show

to do something for the crack

to do something from pure spite

to do something in joke

to do something like it was going out of fashion/style

to do something like nobody’s business

to do something on a shoestring

to do something on the off-chance

something is someone’s Achilles heel

to do something over again

Something rotten in Denmark

to do something stupid

to do something to the point where

to do something under one’s own steam

to do something with a good grace

Is something bugging you?

to do something with ease

to do something wrong

to be something in between