I have soloed some of it as R33 Con, Mrd and Pug. Surprisingly, I never have any problems dealing with Peistes, Toads and Efts. As long as you have Paralyna, Cure II, Regen and you are fine. The hardest part was usually how to pull them away from group aggros and where to fight them.
Mongrels and Zombies are the hardest. I can finally solo them at R36 with luck because they always come in a pair. Some of the Cockatrice leve( All cracked up) and Jelly fish leve did too much damages very hard to my R34 class.
I have also soloed the R40 faction leves (The 2 leves that you fought against 8 Amaljaas and 8 Ixals)as R34 Con, Mrd and Pug with ease.
As for getting to the camp Treespeak. You biggest problems are the Birds and Roslings. Efts are slow and won't really chase and attacking you unless you are really slow and sucks. Birds have very very narrow eye sight and you can literally ran pass them at the side with a 5 ft distance. Never run directly into them and never stop running. Protect, stoneskin and regen are your friend.
Edited, Apr 20th 2011 8:29am by Golophei