I suppose it depends on what you need. If your needs are for, say, specialist surveyors, the chances of a pile of those happening to be unemployed are, I imagine, rather small.
OTOH if you want someone to stack shelves or what have you, not so much.
Perhaps. if an employer needs surveyors, the employer should ensure a steady supply of trained surveyors by having a process whereby previously unskilled workers are trained to become surveyors? Thus also providing a stimulating and promising work environment to unskilled people who want to become surveyors.
One of the unfortunate side-effects of Rogernomics was the loss of the highly effective work-while-you-learn apprenticeship and NZCE/NZCS schemes.