How often should a female conduct a breast self-examination?

BSE's aren't very reliable however it's important to know what your breasts usually feel like in your cycle so you can detect any abnormalities and immediately contact a doctor who can diagnose those abnormalities. therefore it is important to remain vigilant as opposed to setting a set schedule.

Keep your hands washed and trash kept in trash cans.

There is no best way to cut yourself without hurting yourself. to heal yourself, seek a trusted adult or friend. cutting yourself will only hurt more. hope this answers your question : )