But because of economic reasons, and many coaches are not professional enough. Self-tutoring is ok. You should study more and look at professional forums, such as Dabin Forum.
Read more professional books, it is best to read foreign ones, and domestic ones are copied. Wade has good physical fitness.
The most important thing is the correctness of each action. There is a good French book called Fitness Picture Book, and you can also go to Youku to watch the video of action demonstration.
Read more information about many details, plus your own experience, and don't weigh too much before the action is correct.
Otherwise, it is easy to get hurt.
Good luck, don't be impatient, find the right direction, stick to it for one year, and you will make great changes.