First of all, you will need a healer friend - or another account with a healer. Go inside SL, and on your right you will have:
pull 1: a single mob. Kill him and move on.
pull 2: a group of three mobs, one of which a healer. Will take a while, but kill them and you will get to
pull 3: a group of two healers. Now here you can swap to the weapon you want to level and just get bored swinging at them. The mobs will keep healing each other much faster than you can kill them (they have renew+heal) and the healer friend / alt will keep the warrior alive. if extra threat is needed so that the other character doesn't steal aggro, just go to your "main" wapon and throw a few sunder armors on the mobs, and back to work. I used this tactic to get my mace and sword spec to max, but it was a long boring night indeed.