I didn't think I was good at soldering until I invested in a good soldering workstation. That is:

* A microscope with a good working distance, and a large screen.

* A soldering iron with very short grip to tip distance. Miniware TS1M with 210/245 tips is a good choice.

* Some proper jigs to hold things. (Stickvise, sliding magnet plates)

* Good extraction so I don't worry about fumes. (Setting up over a stove range hood is great in a pinch)

Also just watching some of the soldering masters at work: https://www.youtube.com/@ycs-yang/videos

I don't have heaps of experience or the steadiest hands, but I'd be comfortable doing a mod like this cleanly now. One good tip is to get your work piece in a position where you can securely rest the blade of your hand on the table or something secure. You want to minimize the leverage and distance between a secure rest point and your work tip.