Going from relaxed hair to natural hair or from natural hair to relaxed hair is a big decision. If you've spent time on either side and then decided to make a change, it will feel like you're learning your hair afresh.
For the girls who want to go natural, there are two options. You can choose to do a big chop, where you cut off the relaxed hair all at once, or you can let your natural hair grow out and let the relaxed ends break off gradually.