by guess and by gosh
Without careful planning; relying on guesswork and luck. He just throws his essays together by guess and by gosh, but he still manages to get good grades on them.
by guess and by gosh
and by guess and by gollyRur. by estimating; without careful planning. Jane: Did you have a plan for putting up that toolshed? Tom: Nope, we just sort of did it by guess and by gosh. Grandma always made dresses by guess and by golly, without using a pattern, and they always turned out just fine.