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I have to ask. Do you have adjustable sights. Don't get me wrong all the following suggestions are good but it may not be even you. It could be your sights on your gun are off and need to be adjusted. First hand experience. Factory S&W SD9 and it shoots 3 inches low but dead nuts center. My sights aren't adjustable but will be getting some soon. Try a little Kentucky windage. If you hitting dead center but to the left move your sight picture to the right. See what you get there. Just my
I would recommend the NRA basic pistol shooting course. http://www.nrainstructors.org/CourseCatalog.aspx NRA courses are excellent for learning weapons skills and techniques.
How helpful will .22 practice be for getting better with a .40?