It is quite easy. The best time to take a clone is after the plant shows female, but before buds begin to develop. Pick a small bottom branch. Two days before cutting it , spray the entire plant with a teaspoon of baking soda, and a few drops of liquid soap mixed into a qt of water. The day before cutting, spray the branch you will cut again. Both times spray in the evening only. Next day take your clone.

Examine your cuttings carefully. Discard anything that looks suspicious. If you see any signs of WPM scrap the whole idea. WPM is the gift that keeps on giving. Like a bad social desease, once in your room is next to impossible to get rid of.

Hope this helps.