This is the method my mentor taught me, and I've used it successfully several times since:
1) Put the frame the queen is on into a nuc having checked there are no queen cells on that frame - if there are, remove them or put the queen on another frame.
2) Dunt the bees from two or three frames into the nuc, but do not dunt from a frame containing queen cells.
3) Add two more frames without QCs from the parent hive, making sure one has some stores.
4) Seal up the entrance with grass and position somewhere else in a different direction - distance isn't a factor, I've had them on adjacent stands without issue.
This is the step that should prevent most of the bees from returning to the parent hive. By the time the grass has withered, most will have forgotten where they came from and will return to the new box.
What you should have is a mini colony with the old queen, some brood, some nurse bees shut in. Watch it does not starve if the weather turns poor. This is your insurance colony if the new queen does not mate!
5) Assuming that the bees have not swarmed and you have unsealed QCs, wait another 4 days at least so they cannot make any more and then go into the parent hive and leave a "nice" QC, removing all others. Do this by finding the chosen one, brushing off the bees to see there are no more on that frame and then you can dunt the other frames to check for and remove QCs.
What you have is the parent colony, one QC which will provide the new queen - maybe! If you have missed one and left two, it will swarm!
6) Wait 3/4 weeks, check for new queen who should be laying by now.
If there's any problem with the new queen you can give the hive a frame of brood from another colony to make new QCs.