the simplest method i have tried that has worked for me is to just cut your clone as normal.. after you cut it, dip it in some rooting hormone of your choice.. than simply just put the clone in a glass of water and leave it there till you see roots in about a week or two.. change the water every couple of days or so.. i like to add a lil bit of powdered rooting hormone and maybe a lil superthrive to the water as well, but its not really needed..
my mom has used this method to root house plants since i was a wee lad, and it works great for mj as well.. it may not be the fastest method out there, but its tried and true and will surely work ...