I am looking at replacing some broken trim pieces in the cab of my 94 pickup and plan to take the dash apart once more. Since the last time I had the dash out there has been some unwanted sounds of vibration as though I left a screw or two missing. Are there any step by step diagrams for dash removal or otherwise schematics showing the location of the individual screws / bolts, or would I need to sift through youtube?

 

here is an example of the documentation I am looking for which I believe is the factory service manual. Could there be other articles like this one related to pre-tacoma trucks?

 

The FSM will have a bit on removing some of the dash pieces in the BO section(Body). Maybe not as detailed as you wanted, but something.
The other place to look is on EPC-data.com. Grab your model number off the decal on the driver's door jam and you can get parts diagrams. Those are helpful.

If any of the square plastic inserts used to retain screws are flogged out new ones make a big difference. I recommend either oem or trying Auveco.com. Their catalog is worth familiarizing yourself with