The hardest part is cutting and having the controled environment inside a dome and cutting the fan leaves of each clone so it’s focus energy on building roots and not leaf material. It takes about 2 weeks for them to set roots. It’s not rocket science but there is a difficulty degree to the whole process. Also clean and sterilization of work place helps prevent contamination and/or disease.
If you buy a clone, mostly all that work described before is well done and you will have a started plant with roots in a solo cup or pot, sometimes clones are root bound so transplanting to a bigger pot is advised.