The easiest way to solder this is to made a PCB. This connector mount on the PCB, so if you make the correct footprint, the connector will "snap" into the PCB and all the little pins will be on their correct tracks. Most PCB mask feel "anti-soldering", so it is quite easy to not solder 2 pin together if you go easy on the tin. You can use Flux also, but some manufacturer already place flux on the pin of the PCB and some tin come already mix with some flux in it. You start by soldering the 4 big pins first so the connector don't move and after you can go 1 pin at the time.
With these tracks you can lead them to most conventionnal and easier part to solder with wire or what ever.
If you don't use a PCB, well it is more about dexterity and patience than any special technique
Finaly, go slowly if you don't have a microscope, it could a real pain to see if you short 2 pins together.