Do you have a torque wrench or a breaker bar?
I bought a cheapo $10 torque wrench from Autozone that was around 12+ inches long, and it worked well. Still had to apply moderate force though.
Just remember, the longer the handle of the wrench, the better.
If you are trying to do it with a socket wrench, forget it.
You would need a long torque wrench, a breaker bar, or air tools.
Good luck, suspension parts can be a bitch.