Throttle to idle before touchdown, I think it should be about when you cross the threshold. Re-read the IP post.
as for how do I maintain directional control, I use medium pressure not threshold braking and make use of differential braking.
Prior to that I maintain 13-15 AOA in the aerobrake and rudder to maintain centreline, once the nose drops on its own I maintain full aft on the stick and deploy full speed brake, then as suggested I test out the brakes. Once speed is about 70 I brake carefully.