Oh definitely! We have to be patient and recognise that it's an ongoing process because we are human! Even the best of meditators can act upon emotion needlessly sometimes! Don't be frustrated - just feeeeelll into what it is you're feeling and try to catch it before it becomes strong enough to react to. The fact you are noticing is HUGE. The more you are aware, the less you react - you just notice ' ah, there's that frustration/anger/fear' thing - not "I am scared" - this can really impact on our karma!