On both my 79 bonneville and my 80 yamaha, it was easiest to just remove the front wheel, remove the fender, brakes etc. and slide the forks out of the triple trees then remove the seals that way. If you need real detailed instructions I can help a bit, but this is a pretty simple procedure.
1980 Yamaha XS1100SG--Running and riding, but not 100%
1979 Triumph T140D Bonneville Special--getting a new head gasket, maybe cams