Glagol sdelovat' / posledovat' trebuet struktury: za + Tvoritel'nyi padezh.
No kak perevozhu sleduiushu vyrazhenie?
"I always try to follow a specific program during my working hours. But most of the times I don't make it"
Ya vsegda pytaius' / staraius' sledovat' konkretnuiu programmu (ili za konkretnoi programmoi) v techenii rabochnogo dnya. No v bolnshistve sluchaev mne ne udaetsya.