A blocking screw insertion guide useful for proper alignment of blocking screws used in intramedullary nail fixation of fractured long bones. The insertion guide including a intramedullary nail dummy head consisting of a short segment of the proximal portion of an intramedullary nail a nail insertion handle of the type used to insert intramedullary nails and a blocking screw guide portion. The invention also includes a method of intramedullary nail fixation of fractured long bones using the inventive blocking screw insertion guide.