Just got done soloing Lumber Jack as whm/nin (solo whm ftw) Heres my strategy:
Kinkobo + platinum grip + pammamas
stack as much evasion gear as you can
Pull him to where there are all kinds of weak mobs around
Killed weeping willow using NPC on Stulwart Shield mode, Made sure he had hate before he poped all the babies so they all attacked him rather than me then went through killing them one by one. By the end of this NPC was pretty much dead, don't bother curing, it's not worth it stonega will kill him any ways.
Now the hard part...
be sure to keep him para at all time. Keep yourself haste barstonra and barpetra. Erase any thing he does to you reight away, but para is higher priority. after the first half hour you'll get the hang of it.
Set macros for Dia on <stnpc> and Spirit taker on <stnpc>.
When you get need mp: w/o disengaging the lumberjack Dia a Sapling wandering around the area and spirit taker him... This can all be done w/o losing claim on Lumberjack (I had a party of 6 people watching me do the whole fight waiting to take claim) from this you should easily fill your MP bar (I averaged 600)
Rinse Wash Repeat..... for about 3 hours and he'll finally go down.
Good luck and here's some screenies to prove I'm not just pullen **** out of my but :)
http://i22.photobucket.com/albums/b350/scobe1/img_20070617_215422.png
http://i22.photobucket.com/albums/b350/scobe1/img_20070617_213756.png
http://i22.photobucket.com/albums/b350/scobe1/img_20070617_224308.png