Number one, self surgery is for idiots and/or masochists. This is coming from an idiot that doesn’t mind doing his own stitches and minor procedures.

But, no, even a trained surgeon can’t guarantee an improvement on scar tissue. And by improvement, I only mean making it smaller/less visible. To the contrary, the more you fuck with scar tissue, the worse it gets usually. You can sometimes achieve reductions in size, and there’s times when scars that impinge on mobility can be altered the reduce that problem.

But it’s never a sure thing at all. There’s the risk with mobility impairment that it could get worse.

I’m a fair hand at stitches, have access to suture kits and fancy gear to do the cutting, and I still wouldn’t fuck with my scars if it wasn’t life or death. Well, or if I wanted them to look different; I actually dig my visible scars, but it might be nice to change the details I guess.

For one thing, have you ever tried to sew one handed? Because at some point in the process, you’ll have to if you’re working on your own body. You can’t both suture and keep a wound closed enough to prevent a giant mess and blood loss.

With that kind of limitation in place, you aren’t going to do good sutures at all, even if you were trained. If you were a plastic surgeon, you would do better than a random asshole like me, but you couldn’t do your best work.

Cutting down the middle of the scar, btw, is about the worst way to go about it. That can work for “loosening” a scar that’s drawn the surrounding tissues tight, but you have to plan the approach right or it can get worse instead.

Generally, if you were to do what you’re suggesting, the most likely outcome is the scar getting bigger because of the way scars form.

My hands hurt, so rather than typing it up my way, Here’s the web md version which is okay as general overview, so it won’t really get deep into what you’re specifically asking about, but you should be able to extrapolate.