roll up one's sleeves
roll up one's shirtsleeves

One could no more do that than one could roll up one's sleeves and go down into the muck.

3rd BZÖ election poster: "To roll up one's sleeves and tackle problems!"

The only way to be sure that one's code is completely cross-platform compatible, which is essential on the Web, is to roll up one's sleeves and work with the raw code.

Indeed, it struck him that if one truly wished to make a difference among the East End's crime and poverty, then one needed to roll up one's sleeves and wade into the human morass which constituted its population.