I removed all the roots completely, leaving only the bare neck to stick down into the pot. First, I prep the pot by writing the name of the plant on it and filling it with soil nearly to the top. Then, I pull the plant out of the pot and begin pulling off (quite ruthlessly) all the lower leaves, flower buds, suckers and dried bloom stalks. Once I have the crown in hand, I use a small snap knife to simply cut off the entire root system, soil included. What I have left is just a short, 3/4 inch main stem, which I sometimes scrape just barely.
I then just stick the stem into the soil so that the crown rests on the soil surface. I lightly tap the soil into place and then top water with a very thin stream, all around the surface and under the leaves. Once the soil is barely damp, I place the pot into the tray of lukewarm water for about a half hour. Then, it's transferred to its permanent tray, and finally, domed. I take a small post-it note and write the date 4 weeks away, attach it to the dome and place the whole tray on an upper (warmer) shelf. In four weeks, I will begin the process of removing the dome little by little until the plants are acclimated to the outside air.
I'll try to follow this process for you, taking pictures as I remember. The photo above shows the finished tray before doming. Most of the plants are not touching each other, but by the end of four weeks, it hopefully should be a jungle. I will have to diligently check the tray once or twice a week to make sure the plants are not drying out. I'm hoping to tackle another bunch of plants soon.
In the meantime, I've been cleaning shelves as I go, culling out plants from the collection, separating babies from leaves, and repotting duplicates with wicks to give away to friends. Also, with each and every change that is made (down to a simple change of location for a specific plant,) I have computer work to tend to so that my inventory lists are kept up to date. All of this work is why I wait until after the holidays!