How do I solder on the new port without melting it?

Okay so I've tried to solder on a new charge port to a ZTE ZMAX (boost mobile) I used my rework station which goes up to 450 degrees. It took a second to rework the solder and pop out the old one but putting the new one in.... yeah sorta melted. I feel like it wasn't my fault though but maybe I'm mistaken. I see in a video on here on how to rework the old one off and the new one on without actually soldering, just by using the rework station. That's awesome and I'd like to do the same for this Galaxy Tab 4 7.0 but I feel like the inside plastic piece is going to melt like it did on the ZTE replacement part and cause the charger not to clip into the port correctly. The reason I'm not for sure on weather it was my fault or not is because well I've seen guys do exactly what I did but theirs worked fine, I was wondering if the inside of the port is even suppose to be plastic in the first place or is that a quality thing? I really don't see how others do it if the inside of the replacement port they use also is plastic, and the plastic I'm talking about is the plastic tab that has all the connection tabs on it not the actual charge port (that is metal of course). I hope someone can shed some light on this problem for me, thank you!

P.S. Any advise on how to get better at using my rework station and my soldering iron would be appreciated and maybe some tips on how to start working towards micro soldering (really want to get into this).