Self Hypnosis help

First I would like people who have had positive experiences to answer this question, thank you. I have been practicing hypnosis for some time now about 10th grade which was about 4 years ago. From the beginning I was able to put other people into trance easily with both informal, and formal inductions. However, when it came to myself it I was unsure if I was in trance, or rather if I bypassed my critical factor. I definitely was in trance as I realized that my surroundings faded away, and my imagery is vivid etc. So now that I have pretty much become able to go in trance and out of trance whenever, or wherever I am at. I still have trouble with actually achieving certain results. Now don't get me wrong I have achieved a lot with hypnosis, but accidentally, it seems to have never been the targeted problem that I have been able to fix. For example, just the other night I led myself through this technique which allows you to change filters for daily events, my problem was simple. All I needed was to apply a different filter to whenever I was around this other person, because for some reason I felt extreme anger around him. So thinking that all went well during my session, I went around again and the feeling returns again, however I am just more relaxed in general throughout the day. That was not a complete success but also not a complete failure. I feel that I don't actually have a clear understanding of what happens when you bypass the critical factor. When I hypnotize someone else and bypass there critical factor. What is described becomes real to them I ask them to notice how relaxed they will become as they here my voice. This elicits a very clear response. For me I have to go through much more to even achieve a fraction of what my subjects achieve. I have to literally focus on a time that I felt relaxed mere suggestion does not cut it. I even played with someones sense of time and it felt completely real for them. For me it feels like I am forcing it. So my question to you guys is this, what must be practiced to achieve more powerful hypnotic phenomena within yourself. When I experience these states it is usually by accident.