Peaking: sliding on the wave of orgasm.

If you're just getting started in picking, then masturbation is probably the best method for you, because only you really know when the moment of orgasm is coming and how it's getting closer. Stimulate yourself to climax and then reduce the stimulation to a level where your arousal is minimally reduced and you can control your orgasm. This process will not always end in success, but practice will improve it. Just don't give up. By the way, sex toys improve masturbation and help you better understand your body.