Wear a hat to keep the dandruff off the film.
I slip out the darkslides a little less than halfway, orient the holders vertically on a table with the flap toward me, and insert the film with the notch in the lower left corner, so if somehow I lose track of what kind of film is in what holder, I can just open it up a little in the dark or in a changing bag and feel the notches, without having to remove the whole sheet. I label the holders in pencil with the film type as well, if there's a place for that. If not, I use a Post-It.
The Kinetronics 4" brush is a handy and useful thing for filmholders, lenses, negs, carriers, and vinyl records.
White side out is unexposed, black and locked is exposed, black and unlocked is empty.