On an RJ100, the basic procudure was:
Use max thrust - no derating
On runway, brakes set, set full power on the asymmetric engine and mak a pencil mark on the quadrant, so you can set full power easily when you take off. Reduce the thrust to 50%N1.
Set full power on the two symmetric engines.
Release brakes.
When at 60kts set full power on the asymetric engine - any earlier and you will not be able to maintain directional control.
Some limitations were
1600m viz and 1000ft ceiling at depature destination at alternates.
Max crosswind 10kts.