Shampoo and conditioner bars are very convenient and easy to use and if used properly the bars should last for 80+ uses for shampoo bars and 100+ uses for conditioner bars. The only real difference is that the bars do not contain water so they do not require a plastic bottle. The bars will utilize the water in your hair to produce lather. They are extremely concentrated so a little goes a long way.

To Use: Simply wet your hair then wet the bar.

For shorter hair, you can lather the shampoo bar in your hands until you have enough lather, set the bar down, and apply the lather to your hair. Proceed to massage through your hair like you normally would. Rinse out the lather and proceed to conditioner bar.

For longer hair, make sure there is a sufficient amount of water in your hair to produce abundant lather. Apply the bar directly to the hair in downward strokes. Set the shampoo bar down and massage into hair like normal then rinse out, repeat if necessary and then proceed to conditioner bar. 

Storage: Keep bars dry between uses. Best stored outside of the shower.