Harry's Oversights v. Intuition

[gelite67]

No: HPFGUIDX 148495

I think the series presents an interesting contrast between Harry's 
(hopefully) growing intuition concerning his magic powers and his 
oversights/failure concerning the use of magic.

Several oversights spring immediately to mind, one which has recently 
been discussed:  Harry's failure to use the summoning charm to obtain 
the dragon egg in the First Task.  However, later in GOF, Harry could 
have used Accio to again bring him the egg and the MM when he got his 
leg stuck in the staircase, but failed to do so.

In OOP, he had the mirror that Sirius gave him, but instead of using 
the mirror, he broke into Umbridge's office to use her fireplace to 
talk to Sirius. (And he didn't use Reparo to fix the mirror after he 
broke it.  Maybe that wasn't an oversight. I think he thought the 
mirror was now useless, but maybe he shouldn't be so quick to jump to 
conclusions.)

Also in OOP, Harry "forgot" to ask Ginny what if feels like to be 
possessed by LV.  And he didn't think about using the thestrals to get 
to the MOM. (Of course, he was under great stress at that time, but 
that worries me all the more, b/c it is during those times that he 
needs to think most clearly!)

In HBP, of course, he forgot about using fire to drive away the Inferi, 
even though DD had told him that shortly before.  He also failed to 
throw away or destroy the love-potion spiked chocolates that Romilda 
gave him.  The former was understandable, but the latter was very 
careless, if you ask me.

By contrast, consider how Harry simply knew how to use the Basilisk's 
fang to destroy the Diary in OOP.  Or how he figured out that he had to 
drive away the Dementors from the lake in POA.  

I'm hoping there are other instances of intuition that I'm forgetting, 
because it troubles me that so few of those come to mind, while Harry's 
oversights spring so easily to mind.  Can anyone think of other 
examples of Harry using his intuition to figure out which magic to use 
to solve a problem?  Especially a problem that needed an immediate 
solution?

Are these merely plot devices?  I'm wondering if we are to attribute 
Harry's oversights to the "no one can think of everything" camp or 
whether JKR is deliberately foreshadowing some major oversight that is 
going to occur in Book 7.  

I think Harry's intuition is going to come into play in figuring out 
how to find the Horcruxes and destroy them (after all, he doesn't know 
how) and how to kill LV.  Because of their "connection" I think it's 
going to take more than just a simple AK.

Angie (who has been known to make a mistake or two herself)