Scheduling Formal Meditation

Is it considered better practice to stick to a strict schedule of walking/sitting meditation even if doing so will involve trying to settle into meditation while being plagued with hindrances (pañca nīvaraṇāni)? Or just wait until things are calmer and conditions are better even if that isn't until the next day? I.e., is there value to just forcing yourself (as people sometimes have to do to engage in physical exercise regularly) or would the poor mind state negate your efforts anyway? (I practice vipassana meditation if that makes a difference.) Thanks for any help.