A lot of temperature control soldering irons are a lie, i forget what you need to look for, but it needs the right number of connectors to the soldering iron, some of them just use guess work.
I like digital ones, and on top of that, get some different tips too when buying.
After that, it's just all down to practice, patience etc.
Also, pro tip: NEVER EVER check the iron is hot with your tongue. You will only do this once. And yes, this is from experience.