It takes time and willpower. Your best bet is to eat whole, healthy foods, stop eating any and all foods which are processed, and also grains. Don't believe the hype that oatmeal reduces cholesterol because it's not true. Take salads to work, and maybe some sort of meat.
Meanwhile, you didn't say how high your cholesterol is. Mine is 212 and i'm not worried about it. It's what they consider borderline high and the truth is, they did a study on elderly people and those with higher cholesterol, lived longer.
The building block of each cell in our body starts and ends with cholesterol, as well, so without it, we'd be dead.
My husband's cholesterol was 119 when he had a heart attack, by the way.
High cholesterol isn't going to be a worry of mine because there is absolutely no scientific study which says it causes death. Our health problems in the USA revolve around eating sugars, grains and processed foods.