The other versions are too hard for Jimmy Page!  Here's how I do it:
First, for a totally accurate sound you need a Les Paul or equivalent, a Wah, and a Marshall amp.
(for an even better sound, use two Marshall's and isolate a slight echo or delay to one).  Distance
miking is used on the recording for the rhythm sound.  But enough of my yackin', let's boogey.

There are three ways to play the main riff, just use whatever sounds right to you.

G-----------------------9---9---9----
D-----------------------9---9---9----
A-------10------10------7---7---7----   repeat
E---7-------7-------------------------

G--------------------9---9--9----
D--------------------9---9--9----
A------5-------5-----7---7--7----    Jimmy plays it this way
E---7------7----------------------

G-------------------1----1---1----
D------0-------0----2----2---2----
A---2-----2---------2----2---2----
E-----------------------------------

Chorus is done like this:
                            ^^^^^^^^^^^^^^^^
           G--9-9-9-9-9-9--------
           D--9-9-9-9-9-9---7----
           A--7-7-7-7-7-7---7----
           E------------------------

I use a bottleneck on my middle finger to do the slide.  Or you can use your microphone stand.

Verse:

You need coolin' woman I ain't foolin'.  I'm gonna send ya back to schoolin'.  Way way down
inside, honey you need it, gonna give you my love gonna give you my love. Ohhh

Chorus:

Wanna whole lotta love?   Wanna whole lotta love?   Wanna whole lotta love?   Wanna whole
lotta love?

Verse:

You been learnin' baby I been yearnen'.  All them good times baby I been misusen'.  Way way
down inside honey you need it.  Gonna give you my love, gonna give you my love. Ohhh

Chorus into interlude and solo.  Use a Wah pedal during the solo to get the truly raucous sound.

Solo:
          b                 B              b                                 ~~~                                                     ~~
E---------------12--------------------------------------------0---------------
B------------12-----15-12----------------------------------0------------------
G---------14----------------14-14-12-14-12-14----------2/4-----2-0h2-0h2-0h2-0--
D------------------------------------------------------------------------------2
A-------------------------------------------------------------------------------
E--0--0------------------------------------------0--0---------------------------
                B  b       ~~~                       b   ~~~~~
E-------------12--------15---------19---19-------------19-----
B---------12----15-15----15-----17---17---17------17-19--19---
G------14-----------------------------------------------------
D-------------------------------------------------------------
A-------------------------------------------------------------
E-0-0-----------------------0-0----------------0-0------------

Verse:

You been coolin' baby I been droolin'.  All them good good good times I been missing' you.
Way way down inside honey you need it. Gonna give you my love, gonna give you every inch a
my love.

Chorus to Bridge:
N.C.                       E  A
Way down inside  you need         Looooooove

Verse:

Shake for me girl.  I wanna be your back door man.  Keep a coolin' baby.  Keep a coolin' baby.
ETC.

Repeat the main progression about a million times.


That's it.  Almost forgot the Key.

B= bend
^= slide
~= vibrato
h= Hammer on