I can recommend 2 books for those who want to try to learn, but tbh i think a retreat is still required to reach them:

1. https://www.amazon.co.uk/Right-Concentration-Practical-Guide...

2. https://www.amazon.co.uk/Mindfulness-Bliss-Beyond-Meditators...

Leigh Brasington reports that people he's spoken to who have studied kundalini yoga say the strong piti of the first jhana is the same as awakening the kundalini, so there's a bit of an "all roads lead to Rome" about these practices, which is encouraging.

Both authors are on dharmaseed. Worth checking them out. They're both great teachers.

Maybe meditating will be relatively easy for you. That means you would be able to naturally get into a state of very pleasant joyful relaxation. Once you learn to focus on the breath you start to notice some spontaneous feelings of wholesome pleasure which you can then expand to become immersive. It's called jhana/dhyana practice in Buddhism and you can get more detailed instructions in books like these:

https://www.amazon.com/Focused-Fearless-Meditators-States-Cl...

https://www.amazon.com/Right-Concentration-Practical-Guide-J...

https://www.amazon.com/Mindfulness-Bliss-Beyond-Meditators-H...