Harry's Ability to Find and Destroy Horcruxe

[gelite67]

No: HPFGUIDX 150811

(This is the second post; I forgot to include my name on the first, 
so I deleted it; hope the delete goes thru.)

I'm having trouble wrapping my mind around how, as a practical
matter, Harry is going to find and destroy four Horcruxes in Book 7,
when it apparently took DD years to find and destroy two, which
ultimately contributed his death.

If finding and destroying Horcruxes was so difficult for the greatest
wizard in recent history, how is Harry going to pull it off?  DD gave
instructions only on what a Horcrux is and possible things to look
for -- but he did not explain how to determine a Horcrux is a Horcrux
or how to destroy it.

I suppose Harry can consult DD's portrait in the headmaster's office
at HW, but Harry said he wasn't going back to HW.

Assuming DD cannot communicate with Harry from the beyond outside of
HW, I guess there are two options:  either Harry figures it out on
his own (meaning with Ron's and Hermione's help) or JKR is going to
raise another guide for Harry (IM0, Regulus).

But wouldn't it be, well, juicy, if somehow Snape and LV had a
falling out, Snape escaped, and he and Harry had to hunt Horcruxes
together?  I don't really see this as a possibility b/c I think Snape
will do whatever he can to stay in LV good graces so he can protect
Harry, but what a twist that would be! 

Angie