There is some interesting info here... WTF??
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once plant grows it's second set of real leaves, I would:
Take a spoon, and go into and under soil where plant is...
Touching roots not a problem...
Scoop out plant and soil and transplant whole mini root ball and plant into new pot...
Dont worry if roots are tangled, don't worry if plants droop a bit when done...
Water in new plant into new pot...
You'll be fine...
Once in new pot, plant will most likely stall it's growth a little, as the roots stretch down.
When new growth shows on top, the roots have already grown...
Good Luck man...