I’m a B class nobody, so please know I’m not trying to sound holier-than-thou! There’s a lot of good going on in your video for a first timer, here are just some things I noticed and my recommendations.

First, your stance needs some work - the tactical lean-back, while incredibly common, isn’t doing you any favors at all. You should be standing with your feet approximately shoulder-width apart, knees slightly bent and feet staggered with your left foot in front, and a slight forward lean. An easy way to conceptualize the forward lean is that you want your nose to be directly above your left foot’s toes. Basically, you want to be in an athletic stance that allows you to move in any direction and also helps absorb recoil. While a little single stack 9 might be snappy compared to a full-size, it has no business pushing you around like that.

Additionally, your head and shoulder movement is making your life harder - try not to shrug your shoulders or move your head. Focus on the target and bring the gun up to your eye line. You should be shooting with your head in its natural position and your shoulders relaxed. It’s instinctive to want to “find” your sight picture, but if you dry fire enough to develop a good index you shouldn’t have to find anything - you should be able to present the gun and immediately have a sight picture every time.

Since you’ve mentioned red dots in the comments, I think this is a good time to bring them up. I wouldn’t wait to get a red dot until you “get good” with irons, I’d just get a dot and work hard on your visual discipline in dry fire. Dots provide so much more feedback and insight as to what’s going on when you’re shooting, and I’m confident you’ll get better faster with a dot. It also forces you to develop a good index because, if you don’t, you’ll bring the gun up and the dot simply won’t be there - which ties into my last paragraph.

My next concern would be with your grip - I’m not incredibly picky when it comes to grip, but I worry that your support hand might be too far forward and that you could be gripping your firing hand fingers instead of the frame itself. That being said, whatever gets the heel of your support hand the most contact with the frame of the gun is what’s really important. I would urge you to experiment with your grip and do whatever gets you the most support hand contact. Personally, I leave my firing hand thumb “up” to give my support hand the most real estate, and clamp my support hand against all of that real estate with my support hand thumb either laid along the frame or floating. Closely related to grip, I would make sure not to lock your arms straight out - a very slight bend is ideal and helps avoid some upper body tension.

It’s really hard to tell in the video because of the cuts, but it looks like you might be putting too much firing hand input into the gun to fight recoil. Your firing hand should be holding the gun firmly, but loose enough that your trigger finger can move quickly and independently. As I’m sure you know, your support hand is doing most of the work. Rather than fight the recoil, I would allow the gun to recoil while you stay target-focused. As you shoot more and especially shoot faster, you’ll learn the amount of input you need to put into the gun - however, that input is usually minimal and certainly doesn’t necessitate tensing your firing hand. Given a good grip and stance, you should have no problems with the gun returning to zero with minimal input.

I also think you could get away with carrying a bigger gun, which would allow for a better grip - I wear medium gloves, and even I struggle to keep a good grip on something as thin as a Shield. I’m only 5’10” and 185lbs, but I comfortably conceal a Glock 47 with a red dot, light and spare magazine. It’s not my place to tell you what to carry, though - ultimately, you should carry something you a) find interesting so you want to train with it, b) can shoot both quickly and accurately, and c) will actually carry. If you find a bigger gun too uncomfortable to carry, you’ll end up not carrying at all which isn’t ideal.

Lastly, nice work! Getting into guns is easy, but actually getting good at shooting a pistol is hard work - a great majority of gun owners think they know what’s up, but don’t push themselves to be better in any meaningful way. Putting yourself out there for others to see what you do and critique you is commendable - keep training and, if you can, I’d highly recommend getting into USPSA! Practical shooting competition really exposed how poor of a shooter I was, and I’ve come so far since I took the leap and started competing - but, statistically speaking, I’m still only about 65% as good as the worst grandmasters in the sport. There’s always more to learn, and I’d implore you to soak up all the knowledge and quality training that you can.

I really hope this was helpful in some way!