AusBonsai

Boon advised that it was dangerous to completely bare root a pine. You can do one side and wait a year or two before doing the other.
Deciduous can be bare rooted and repotted into the new medium. (best done in late winter)

Thanks Gerald,that`s coming from the horses mouth and someone that should know.

These two DVDs display the correct repotting and 'wiring-in' procedures for both Deciduous and Conifers. You will see that the 'stock' maple is bare-rooted but the JBP is not.
http://bonsaiboon.com/pages/shopping/sh ... etail.html
http://bonsaiboon.com/pages/shopping/sh ... etail.html

I tend to do half of the rootball this year, half next year with pines.

http://ofbonsai.org/species-specific/co ... black-pine

Also, remember to water and fertiliser more frequently with this mix.