My first post here, so hi all!
Ok, you'll have to be lvl 40+ (or it might work with swift pot, haven't tested yet). Southwest of the horde AV entrance, it's a large cliff with lots of humanoids (42 or something). Walk to the end of the cliff, facing Tarren Mill Inn. You must aim very carefully to hit, then use slowfall/noggen, mount up, and jump. You should land on the Inn roof (usually you'll get hit once by a deathguard, if you're alliance, but if you don't, you won't get dismounted, and can jump on to the church roof) This is a very easy way for alliance to farm HK's if you're lvl 40, as it's usually 34+ hordes there, on their way to SM so what you have to do, is:
1. Go to the edge of the cliff southwest of Horde AV entrance
2. use slow fall/noggenfogger elixir
3. Mount up, and aim towards the edge of the Inn roof
4. Jump, and hope you hit the roof
Just remember, if you stay within the aggro range of the lvl 60 elite there, she'll despawn, and respawn on the roof, and kill you
I will get some screenshots once my account is Unbanned ^^