how to solder ASP-122952-01(HSMC) by hand?

My past experience soldering a similar QTH connector by hand has been that its really hard to get a reliable solder joint and you end up wasting more time and money than just having it stenciled and reflowed somewhere. In the end you'll be questioning whether bugs you see are in your code or in the connector!

If you still want to do this, then what I did was I soldered wires to the ground tabs underneath the part so that they came out the side through a notch I had made. Obviously this leads to a really bad ground loop and goes against all good design practices but it worked for me because I was running at slow speeds and it was a test board. I also had an awesome technician with decades of soldering experience doing some of this for me.