Converting to Hair Soap:

There's a thing with Hair Soap.
If you have only used industrial shampoos before, as I used to, changing to a hair soap usually takes one to four months. That's because all the silicones have to be washed out of the hair. Unfortunately that takes time.
An option to speed up the transition would be to treat the hair with a few high percentage acidic rinse. But then you should also take the time and treat the hair with one or two packs of olive oil.

Since hair is not alive, you can not fix it either. What is broken is broken and can only be cut off. Everything else is filling up and covering up with other non-hair substances. There is no such thing with natural soap.
If your hair is so strawy after the first applications and the split ends are much clearer, you should not shy away from visiting the hairdresser. He can cut off the broken parts and the hair can grow back healthy.

How to use Hair Soap:

The most important thing with Hair Soap is, that it needs water. A lot of water :-)
I put my Hair Soap in a clay pot without a hole and pour water over it one to two minutes before use. Any other container, cup or plastic bowl will do fine as well.
Now get your hair properly wet.
For short hair, creating foam in the hand and then massaging the hair is usually sufficient. The soapy water from the shell can also be poured over the head.
My hair is much longer, so I part my hair and swipe with the soap directly over the hair. From the forehead to the neck down. Then I go with the soap left and right along the hairline. Then again over the neck and finally once or twice over the entire hair length.
Now massage everything properly. It should foam properly. Briefly wetting the hair again can also be helpful, so it foams even better.
Rinse, rinse and rinse and you're done.

Now you can do another acid rinse.
With our hair soaps I do this about every fourth wash.
And since my formerly very greasy hair is no longer greasing as fast, I have to wash it only once a week.