Took me awhile, but not long. Every soap out there acts differently , even the brush you use.
My water is so hard,,, ya have to chew it before ya swallow it. But no problems making good lather with it.
Just practice and learning.
I started bowl lathering, but now I face lather.
Learning to load the brush properly was my biggest problem I found out.
A very easy soap for me.(the one I learned from the quickest) was Vanderhagen luxery soap( green box) and reasonably cheap. If you want to challenge yourself, try Green Mountain or Williams mug soap, their the most difficult that Ive used at this point, but their both excellent soaps. JMHO