Cutting the cord provides stimulation for a neonate to breathe, it is for this reason you will be advised to cut the cord if you call 000. Tactile stimulation is also used to stimulate breathing, so a fairly firm rubdown with a towel (or t-shirt!) is recommended in a neonate with a delayed onset of respiration. If your baby is delivered and starts to breathe spontaneously (a cry is a good indicator), there is no need to cut the cord with a dodgy pair of dirty scissors. If your baby is flat (has a poor APGAR) and does not breathe spontaneously, you should give bub a rub down and clamp the cord. If bub still does not breathe, you need to commence EAR/CPR.
Incidentally, there is little risk of infection from cutting or clamping the cord with materials which are not sterile as there is no blood flow through the cord once it is clamped. The cord will be clamped and trimmed by the ambo's when they arrive.