The word practice is one with several definitions. It does not necessarily mean that one does not get it right when doing something.
Sometimes it means someone is working towards proficiency in something newly learned (such as a well-accomplished musician will need to practice a new piece), the same as someone who practices medicine will, after some years of treating patients, encounter a new procedure. Every long-term study will have new things to learn along the way.
Practicing also means putting something into use. Remember, it shares the same root as the word 'practical;' and practical means something which can reasonably be put into use.
There are so many occupations, hobbies, areas of study, and so on, which are a lifetime study. It is very common to hear people say they are lifetimes students. And it is often reasonable to take with a grain of salt anything said by someone who believes they have learned enough.