Self Help Hypnosis

I heard that with self-hypnosis you can control your subconscious which implies that you can also rid yourself of bad habits, increase your concentration….etc… in other words you can CHANGE yourself. Is it true? if so, does it have any side-effects? Is there a simple way to do it? and How? LINK

i just got a instant self hypnosis as your read book. i understand how to do it and everything. but how may tiems do you need to do it before you see any results.. if you do see results do you have to keep doing them forever like a certain amount of time before it [...]