Congrats on your purchase. I bought a standard 9mm Shield in April 2019. Price, around $300 and usable for civilian ccw were the main reasons I bought it. At first I couldn't shoot it near as well as my heavier, longer barreled handguns but the more I shoot it the better I shoot it. You've gotten some good advice here from some handgun shooters that are more knowledgeable than me. Use what works for you and keep shooting, you'll figure it out.
All I can say about the Shield is it's not a target pistol but it's easy to conceal and mine has been dead reliable, never malfunctioned in over 1500 rounds. At what I consider civilian ccw distance, inside ten yards mine's plenty accurate. S&W's been making handguns for a long time. For what this gun was designed for IMO they did a pretty good job.
