The most essential part of trolling is convincing your victim that either a) truly believe in what you are saying, no matter how outrageous, or b) give your victim malicious instructions, under the guise of help.
Trolling requires deceiving; any trolling that doesn't involve deceiving someone isn't trolling at all; it's just stupid. As such, your victim must not know that you are trolling; if he does, you are an unsuccessful troll.
Signs that your trolling is successful:
*Your victim screaming in all-caps at you.
*Personal attacks (Calling you a retard, idiot, etc).
*Being an
Internet Tough Guy.
*Making a crude remark, before quickly logging off before you can retort.
Signs that your trolling is unsuccessful:
*Your victim identifying you as a troll.
*Identifying yourself as a troll.
*Your efforts being ignored.