The times listed in the gig are leading. You can ask a worker to be there 5 minutes early. But remember: they aren't paid for this extra time. This means they aren't required to show up early.
Do workers need instructions before they start? Just set the start time a bit earlier. This gives you time to explain everything. This counts as working time, so you must pay the worker for it.
Always discuss this with the worker first by contacting them directly.
