Well first of all this macro will be very useful when trying to get up there. There is a lot of wall jumping.
Make a macro with this in it (I can't remember who posted this on this site before not taking credit for the macro)
Code:
/run local p,f,m,t=Minimap,CreateFrame"Frame"m,t=({p:GetChildren()})[49],p:CreateFontString(0,0,"SystemFont")t:SetPoint("TOP",0,-9)f:SetScript("OnUpdate",function()p=m:GetFacing()/PI%.5;t:SetText(format("124cff%02xbb00%.3f",255*(1-abs(4*p-1)^92),p))end)

Follow the arrow, and take a right.

Follow arrow, jump to the ledge on the left.

Start off where the pally is, now its time that the macro is useful. Point East and be at .498 or .497 and right click, and jump hit left repeat. This should result in a fast progression up while slowly making your way to the left.

Keep doing what you did in the last step. This picture is just to show you how you should be progressing up the wall.

Keep jumping up..

This is a safe height to jump to that small ledge. (Or just run and you should be able to land on it.)

Follow arrow. Take a left.

Sorry for the black arrows, go up the first set then you can go over to that top ledge or you can follow the white arrow to that will lead to the white X.

I face south and go at about .005-.003 and same thing as you did on the other wall but now you jump and hit right. Now mount up and jump to the spot over the entrance.
That is where I jumped from.
Yay you did it!
(This is my first post, hopefully did everything correctly trying to get out of leacher status because this site > all.)
PS: Sorry for my horrible paint writing and arrows.
This was done on a live server 2.3.2