Check why it is leaking, it may be scoring on the upper fork leg so check them BEFORE you fit the new seals as otherwise you will just tear the new ones as well, if you have pitting to the upper leg then use wire wool (fine) and some T-CUT to get it back as near to flat as possible, DO NOT use sand/emery paper on the chrome as you will have to get them rechromed if you do, as above beware that the spring is under pressure inside the stancion leg and it will take your eye out or your ear off, do exactly as it explains in the Haynes manual and you won't go far wrong but remember to lay out the parts as you take them out so you have a reference when you rebuild it,do one at a time other wise you will mix the bits up, grease every thing as you rebuild it and make sure that the fork seals are level as you push them home, a piece of pipe that fits just inside the fork leg is best so you can knock it home without twisting it. Other than that it's quite easy just remember to take your time, finally don't foget to put oil in the forks, sounds silly but if you rush it's the obvious things you forget. Good luck.