I am not even sure we need to pursue this abilities on their own that much. Any work that grows your spirit seems to have strong effects on your ability to OBE without actually focussing on OBE that much.

After a year of focused self development work I can do energy body skills much easier than a year before which I did not actually practice. The pursuit of self development frees the innate capacity you have for these things, bringing peace, calmness and joy to your life.

And improves your ability to OBE.

Take good care,
Oliver