LOL, I just posted on some transplanting.

HARDON's transplanting guide.

That method probably won't be super helpful, as it sounds like you want to take just the plants/roots and put them into a new home/leave the old dirt w/ the pests. If that is the case, all I can say is be careful!

I actually did that with my current plants: THREAD PLUG! I had them growing like 3 to a 2 gallon pot, so I had to go in and gently grab the roots out of the dirt.

The way I did it:
  • Have a new container already set up, with moist soil and a big enough hole for the rootsystem to go into.
  • Lights off/dim. Roots hate light. (I used a small flashlight with a blue plastic lens on the end; very dim but able to work.)
  • Gently and slowly worked my fingers into the dirt using a shovel fashion, fingertips going up and down to "dig" deeper.
  • Gently felt around for roots.
  • Gently work your hands under/around the bottom of the rootsystem, gently "dig" yours hand back up out of the dirt with the plant/rootsystem; reverse of how they went in (its a good idea to have a friend there to help hold the actual plants while you do this, depending on size.)
  • Gently place rootball/plant into new home.
  • Water w/ a bit of Superthrive added.

The more you mess with the roots, the more stress there is. Period.
(Notice the emphasis on being gentle.)