I’ve just bought, off e-bay, the AX1201728SG quad drive chip for these motors , works well , cheap, and simple to use without any library . ( one pin for direction, one for “pulses” to generate the steps ( rising edge generates one micro step -15deg of the rotor ( which of course is geared down).
Needs a small delay between steps ( so the chip doesn’t think it’s noise?) , data sheet is out there too, from switec .
Motor runs pretty fast and very smooth.