that is fine but it makes no allowance for faulty/worn shifters. If the shifter might be bad, or the control rod might be the wrong length (more common than you might expect) ideally you need to do the check I outlined upthread, in which the engagement of second gear (from neutral) is assessed.
All shifters can wear, and possibly the worst of these is the current SA thumbshifter; this has a slightly longer cable pull from 2 to 1 anyway, and it has a certain amount of 'sticky backlash' from the start. As the lever wears (and corrodes inside...
) this 'sticky backlash' just gets worse and worse, and eventually the lever won't latch into first gear (without overstressing the cable) and
retain good gear 2 adjustment, not both at the same time.