there is a thread about it somewhere on RIU, normally you are suppose to let the plant rest for 2-3 days in a dark area (i have been skipping this step this time I dont think it makes a difference) you want to dive in the containers with both hands and sort of take whats left of the plant out trying to save the main roots and repot (previously I repotted in a 10 gallons but it takes a long time to reveg and it was taking up too much space in the room. This time I am trying to reveg her in a small container) You really want the bulk of the roots but you want to leave the roots that are circling at the bottom out.
Then you water really well, place it under at least 18hours of light, 24 is best for reveg I THINK. It will take about a month before you see anything. Then just when you are about to give up, you will notice something coming out! hehe Once the plant is finally growing true sets of leaves, you want to let her go a little longer before 12/12. When it starts growing it will grow single fingered leaves for a while. I did it in a hurry in the past with decent results (flowered the plant as soon as she had 1 normal leaf growing hehe) But the longer you wait the better.
I think its all there is to it. I am just attempting to reveg one again. It worked the 2 previous times... Good luck and try to find the actual thread