You don't need a torque wrench, you can't over-tighten them. Just turn the socket as much as you possibly can, the bearings actually last longer the tighter it is.

Use a 2 metre extension bar on the end of the socket, that usually does the trick. Plus a couple of mates to help. If you can find a 3 metre bar with a 3/4 inch drive plus corresponding socket and more mates even better.