This is how I hear it off of the original recording on Led Zeppelin I.  There are some other variations in concerts etc. but if you are trying to learn the original this is correct.

h = hammer on
p = pull off


G|-----------------------------|
D|-----------------------------|
A|--10--9--8--7----5--4--3--2--|
E|0--------------0-------------|

Replace that final 2 on the A string with two 0's on the E string on the fourth run through.

Play the intro about 15 times then play this x4
  (x4)
G|---------2h4--------|
D|------2h4---2h4-----|
A|2-2-2---------------|
E|--------------------|


       PART WHEN PLANT GROANS
(randomly play these for a while)
G|--------------------|---------------------------------------------|
D|---------5555-------|---5555-----9999-----------------------------|
A|77775--------7------|-------7--------7---55555---77775------------|
E|--------------------|---------------------------------------------|

Instrumental (3:04)
G|7-------9-------7---------9-9-7------------9-9-----7----------------
D|-757-----979-----757-----9-9----757-------9-9-------757-------------
A|----5-------7--------5--7-----------5--7---------------5------------
E|--------------------------------------------------------------------

-----------------------------------------------|
-------33333---33333---33333----33333---2------|
-----------------------------------------------|
-----------------------------------------------|


Then play this riff 57 times for the heavy sounding solo part
G|---------------|
D|------5h7p5----|
A|---5h7---------|
E|5h7------------|

End the solo this way:
   (x3)               (x4)
G|--------------0--|------------2h4--------|
D|2---0-----2------|-------2h4----2h4------|
A|------0----------|-2-2-2-----------------|
E|-----------------|-----------------------|

Return to the verse riff





Outro

G|-------------------------7777----99997-------9-7\--------9-7\-------9-7\---------
D|--------77775---99997--------9---------------------------------------------------
A|77775-------------------------------------5---------7-5---------7?7------55555-55
E|---------------------------------------------------------------------------------

-----------------------------------------------|
-----------------------------------------------|
55555-55555-55555-55555-55557------------------|
-----------------------------------------------|


ROCK ON
-Willett

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