Dot the i's and cross the t's

Dot the i's and cross the t's: fazer algo com muito cuidado, evitando qualquer tipo de erro

“I've nearly finished the report. I just have to go over it once more to dot the i's and cross the t's.”

“Why can't Jerry dot the i's and cross the t's? I always find mistakes in his work.” (www.englishclub.com)