I'm not sure how correct the usage is, I always feel very casual when I use "really", but I do use it commonly in both those scenarios. I perceive the difference to be this: "You really can [do something]" is strongly asserting that it's true that you can. "Really" is modifying the word can.
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whistle... you [really can] do ... you can [really do] ...As explained in a previous post, the grouping is as shown above.
although i can see now, that there would be a clear difference for the first underlined sentence, it seems to me the position of "
Discovering what you really want to do with your life isn't an easy task for anyone, nor is it something that you can really create a step-by-step guide for.
whistleit seems to me the position of "really" has less influence on the second one, somehowYes. That may be, but to my ear, the second usage of 'really' does apply to 'create' more that to 'can'. I suspect the diminished influence here is due to the negative 'nor' that occurs earlier.