You would have to eliminate all the past memories causing you unhappiness (unconsciously), to do this you would have to destroy all insecurities (which stem from past memories), so you can just use an exercise like reframing, which is reframing a memory into the way you desire then telling your unconscious to handle it in that way from now on. The experience would in a way be gone, gone forever, though it only existed as a memory.
Then once you finally achieve the highest perfection you will finally enjoy every instant, you would not be able to become fearful, angry, sorrowful, etc...because the impulses causing those would be gone.
Don't get me wrong, I somewhat admire Vulcans.. Tuvok, Spock, what a great gang they were - and to a degree the principle of which Vulcans operate is a noble one. However, without having emotions, without recognising and remembering past experience a person will have no 'guiding light' as it were. Without fear people would cross the road without looking, without remembering the pain of touching an open fire one will most likely touch it again. Without emotion and experience, life would be a lot shorter.
I would also, from a professional standpoint, have to disagree with any notion concerning the ability to "tell your unconscious". You are a product of your society, a product of your genes and most importantly a product of your experiences. They shape the exact person you are and every single decision you make in life. You can't just turn them off like fuses in a fuse box no more than you can choose to no longer like the sound of a specific style of music.
There are many ways of 'removing demons'. Some pay me to do a service, some drink large quantities of alcohol, some turn religious. They all have the exact same issues in life and if they had the ability to just switch them on and off so easily not only would I be out of a job but there wouldn't be any religious people left. Your brain will deal with things in whatever way it sees fit. You have no say in the matter, but will take the path that fits best with the sum of your life experiences.