That is ancient advise, and will not prevent a swarm. They will swarm any way, and your hive could end up queenless… 
The answer to 2 and 3 is don’t do it, please.
You have another choice! Read these excellent articles and then consider a spilt as described on page 23 onwards of the second article (modified Snelgrove II):
https://wbka.com/wp-content/uploads/2015/04/wbka-booklet-english-PDF.pdf
Hope that helps 