I do not cut swarm cells out myself. But if I was, it helps to understand a few things about it.
Swarm prevention during swarm season, should be at least weekly (That is way to much for me) The reason being, IF...and I say "if" you do this as I am not promoting this in any way, you must cut them out prior to the cells being capped on day 9. The chances of stopping a swarm by cutting swarm cells go down to nothing, once the queen cells are capped.
Remember, the bees will take a 4 day egg (which is really a one day larvae) and raise a queen. So, for you to cut out uncapped queen cells, you only have a 5 day window.
One of the things to consider, is to just create an artificial swarm yourself. If you remove the old queen, a couple frames of brood, and some of the work force, you do several things. The hive just lost a queen, and therefore "thinks" the bees swarmed. You have opened up the brood chamber and alleviated any congestion, furthered along by the sudden loss of bees.
This allows you to reintroduce the old queen if the new queen fails or is killed. You can also take other queen cells out by the frame (I do not normally cut them) and requeen other dud hives or even start another nuc.
Keep in mind, once the queen cells are capped, the old queen may of stopped laying in anticipation of leaving. This dooms the hive in the situation the old queen swarms, as there may not be any viable eggs for the bees to even consider raising another queen in an emergency. So cutting out all the cell's after they have been capped, and then also losing your queen and half your bees, is about the worst possible outcome. Many of these hives become laying worker hives. Something I try to avoid at all cost.