I guess it depends on how long the nut has been on since it will take a 1 1/4 inch socket on my 93 Legacy. I had to use a 3/4 inch braker bar as I ended up breaking the 1/2 inch one,and a fence post for leverage. The car had 180,000 miles on it so I went ahead and replaced the ball joints as well (good decission) and the roll pin that fits the inner joint. They do make a roll pin punch that fits perfect and makes it easy to bang the pin out (by the way if you just use a punch what happens is that it tends to work its way in between the pin, thus spreadingit and making it more difficult to extract). I will say this it is not an easy job and I used a few jacks in order to get the ball joint back in place without removing the strut. I did use a bit of grease in order to get the new ball joint in, the old one had a bit of rust which made it difficult to extract so thinking of the future I used a bit of grease for that purose, hope this helps....
