Put your servo horn on.

Use the sub trim to put the horn at a 90deg angle (if that is what your instructions recommends).

Adjust the steering turn buckle (the one coming off of the servo) to centralize the steering rack.

Set the steering rods and camber links to equal lengths. It's not import if the toe-out is not spot on at this stage, it will be re-checked again later.

Adjust your steering end points to maximum throw. They should read the same figure each way or with in one or two.

Set you toe-out and camber and then re-check your maximum throw again.

Use the D/R to reduce your steering throw during a race, not the steering end points.