OK, out of the pot...no need to remove the soil around the roots...but you can if you wish...knock it off with your fingers....don't wash the roots...that just delays drying.
And dry is what you want....very dry.

Put them away in the garage or shed for a day or so to let them dry out a bit. You don't want to store a plant in a damp condition.

Take them to that cool place....35 to 50 F...and either hang them up, upside down (because its easier to hang that way) or put into paper bags...keep them opened to let moisture escape...and let them be all alone, dry, dark and cool. OR, leave them in their pots...on their side..and let them remain on a shelf.

No water should be sprinkled on them...what for? That could initiate some form of growth...we don't want that.
So keep the plants dry....very dry.

You might put something on the floor to catch the debris that will surely fall from the drying plant.

In mid February....but can be delayed as late as March......bring them out to a well newspapered table where you will inspect their roots for any damage, you will cut them back after removing all old leaves and flowers, then you can wash the roots free of any and all old soil. Use warmish water. Cut back about half...third....you decide.

A clean pot...6"...8"...10"...depending on the size of the plant...put shards in the bottom to keep the soil away from the drainage holes. Fresh potting soil, make a hole in the center, put your plant in, firm it up. Water to drainage.
Take to the sunniest window you have...east,west or south.
Don't water again until new leaves begin to form...might take 2+ weeks.
When you water, do so always to drainage and dump the excess...never leave water in the saucer below.
Begin fertilizing as the amount of leaves dictate...1/4 rate...1/2 rate...20/20/20.

As the plant matures you can then increase fertilizer and give it 15/30/15.
Turn your plant 1/4 turn every day to ensure all parts of the plant receives equal amount of sun.

May produce flower buds in 5...6...7 weeks...but don't concern yourself if it comes to May...flower buds will come.

That's it.....that's how after 8 years I still have 7 plants alive and kicking.