I use meditation to improve my willpower. 20min body-scan, 10min deep breathing. Slow, deep breathing improves heart rate variability and thus willpower. The body scan changes self awareness levels, which is necessary to change. Imo guided meditation is just to learn how to meditate. Consequently it does not really matter which one you use unless they are really bad done.
- A really good meditation workbook is "Mindfulness: An Eight-Week Plan for Finding Peace in a Frantic World". It really helped me a lot to change and to endure difficult situations. It also comes with it some guided meditations, the context and encourages to meditate daily for 20-30 min. The first changes are noticeable after 2-3 weeks of practice. I would recommend it because it teaches well and fast and is also validated by science.
- Another technique is "mindful focusing" it combines the we5t3rn and ea5t3rn approaches to change https://mindfulfocusing.com
- There are lists of scientific proven technics to achieve high levels of well-being (under the assumption you are not depressed), e.g. https://ggia.berkeley.edu (there are also a couple of guided meditations)
- Generally, I think it is important to have a good self concept: to know your personality (http://www.personal.psu.edu/~j5j/IPIP/), attachment style and to understand human nature and then smooth out your "faults".
As far as i am concerned with self-hypnosis, I think it's too time-consuming to learn and in a heterohypnosis I generally do not trust the hypnotist so that no behavior changes. Imo hypnosis takes the approach of cognitive behavioral therapy, except that the subject does not understand what happens and why it works. If I would delve into the topic, I would probably read "Self-Hypnosis - The Complete Manual for Health and Self-Change " or sth. like this.