I got a lot out of EFT, but got more out of TAT -- Tapas Acupressure Technique. I still use both, but use TAT more.
I would suggest to not expect EFT to work immediately and then get frustrated. The shifts are gentle. Usually one does it for awhile and then notices, hey, this problem doesn't bother me as much as it used to, or I'm more able to do now what I wasn't able to before.
TAT worked more quickly for me, but it was still gentle and not an instant fix, but sometimes I can notice the shift beginning in just a couple of days. Sometimes I can with EFT, too, but for me TAT has more noticeable impacts more quickly.
Sometimes I'll address an issue with TAT and then follow up with EFT, especially tapping in that "I deeply, completely, and compassionately love, honor, accept, respect and value myself." You'll be given a kind of script like that, this is the version I've developed for myself. After a decade of doing these techniques and others, I can honestly say that the statement is true, though I haven't 100% reached the completely part except for respecting and valuing myself, but I'll take that! I'm miles from where I used to be, and the things I've released are permanently released, they don't sneak back up later like some did when I did NLP.
Both techniques made a huge difference in my life. I recommend them often.
BTW, sometimes things will come up that weren't a problem before because the issue that EFT or TAT helped to release was covering them up, and now they have space to emerge in order to be addressed, too.
One other technique I learned that was really helpful in combination with EFT and TAT, is to tap on the inside of the finger near the base of the nail, either the index or pinky finger. To let go of what others have done, tap on the index finger and alternate repeating, "I forgive _______, they did the best they could" and "You forgive ________, they did the best they could." Sometimes you can feel a shift, and even if you don't want to forgive the person (and you don't have to!), it's more a matter of what they did not longer clinging to you, or you clinging to it. You can change the word forgive if it bothers you to something that reflects releasing the person or what they did. For the pinky finger, the phrases are, "I forgive myself, I did the best I could" and "You forgive yourself, you did the best you could."