I have a basic temp controlled solder station with a pointy tip in my iron, well rounded pointy tip, just don't use any flat/chisel tips for small board work. Secure your work piece and brace your hands against your table top, use reading glasses if you need them and with practice you will learn. You want to heat the union so the solder flows into it but without cooking your work piece, it helps to wet your tip and tin wires ahead of time, you will learn how to pull away to get the best results. Check your work before assembly.
I use this solder as it wets quickly and solidifies quickly with no plastic state, the thin dia. .020 - .031 is nice to work with and 63/37 also has the lowest working temp.
https://www.ebay.com/itm/Kester-24-...itm=292370210322&_trksid=p2047675.c100623.m-1