While some ENFPs may have more control on these issues than others (due to socialization, personal work, being chewed out one time too many), it seems that all ENFPs struggle with activities that required sustained attention to detail.
I, for example, absolutely HATE having to do detailed, mundane tasks. For example, filling out expense reports. I certainly can and do turn in expense reports. But I despise filling these out and often put off working on them, if I can think of anything else that needs to be done.
Another problem I have has to do with estimating the time it takes to do something. I am very future oriented. I also can always see all the permutations in any given scenario. So, it's only with much effort that I've gotten better at lopping off options and asking myself, is what I'm doing mission critical to X.
For those of you who are ENFPs and don't struggle with these issues, I've gotta wonder if
#1 - You used to struggle with these issues, and now you've had some success keeping them in check
#2 - You are mis-typed (ENFJ?)
#3 - Or, you were raised with the fear of God in you about such issues.
I think a true ENFP would have to at least struggle with these tendencies. These are the inherent weaknesses that come with our natural strength to take in new abstract information all the time (at the expense of taking in concrete details) and keeping our options open (at the expense of not deviating from the plan).