Spiritual work is all about cleansing karma. It requires constant attention, and it requires us to suffer. Not terribly but at least to the point of working at something that challenges the ego. I tell my students that there are two simple things they can pay attention to through the day that will definitely work to improve karma. One is to ensure that when standing the legs are slightly bent, or at least tending to bend rather than straighten. And never lock the knees. This means that the legs are always working and that they are always softening and that energy is always flowing through them. The second 'technique' is to soften the critical mind. When you look at something notice the tendency for the mind to categorise (name), judge and criticise, and instead simply smile at the thing, and let that smile be like a warm accepting embrace. Very simple but very difficult to do. Working on karma simply requires us to replace bad habits with good ones.