I use a controller, so crossbars are how I go about. It's also probably easier for me to describe how I set them up rather than lay them out in text format. The Cross bar set up basically utilizes three out of a total of eight for quick access. You have a simple L2 or R2 tap then a directional key or button command for one set; another set is accessed by going L2->R2 or R2->L2; and the last is double tap L2 or R2. I mention this because the frequency in which an ability is used will determine which set it is put on.

How I set them up, and how I would set them up on PC is comparable to a keyboard in the sense that the keys are not laid out alphabetically, but strategically in order to facilitate user input. So as an example, my ogcd heals are spread out amongst several crossbars instead of grouped together on a single one. When I set up my crossbars, I literally run around the open world or PoTD fighting mob after mob to 'feel' where I want the abilities to be placed. It's a whole lot of, "I don't like this here; it would be better here" kind of trial and error.

Because WHM and AST are so similar, their overall crossbar set up is nearly identical. When playing either of these jobs, I know that L2->R2->right on the directional pad is my main ogcd heal (tetra/essential dignity), or L2->right directional pad is Regen/Aspected bene. SCH is whole different animal though. There are some similarities such as where I put my limit break, healer bubble, and current role skills, but for the most part, SCH plays so differently than the other two healers that the comparison to my WHM/AST crossbars is night and day.