yellow leaves are generally a sign of nitrogen deficiency, but seeing as they are clearly in the flowering stage the plant needs phosphates, so it would take a more advanced grower to tell you best advice, but from experience, i would examine each bud for tricome color, and trim from there. the entire plant does not need to be trimmed in a day. err on the side of caution when dealing with bud and disease/decay as you can never go back once it is too far