Subconscious diving I learned from this program I bought. First you start out with breathing exercises to get out of your head . Then you think about the things that are running you (usually repressed childhood experiences). After that, you try and visualize the first time you experienced it and allow yourself to feel the emotions associated without trying to change anything or get rid of anything. After that, you do some more rounds of breathing exercises. This allows me to be more accepting of certain aspects of myself and more at peace.
I read self-help books and watch self-help videos mostly on dating, socializing, and productiveness. In particular when it comes to success with women, I find that looking at several different sources allows you to find nuggets of information that you haven't heard anywhere else that will resonate with you. Additionally, if several reputable sources all say the same thing in regards to a specific piece of advice, then it is more likely to be an objective truth. I think that self-help is a lifestyle choice and that when you invest in yourself, others will sense that you value yourself and aren't needy for validation to feel good - both attractive traits in socializing in general and with women.
For me presence work involves regular meditation focusing on breathing. After meditating, I find I am not such a slave to my thoughts and improve my ability to be present in the moment (not being in your head focusing on your worries, past, future, etc...)