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Just need nice big traces.Hardest part is teaching how to solder without lifting board traces.
Good for you.Traces are lifted when the soldering iron tip is too hot. Then the rosin burns away instantly and the glue on the traces is vapourized.
All my career I used Weller temperature controlled soldering irons that last forever and work extremely well.
My personal Weller temperature controlled soldering iron is about 46 years old and is still made and sold. Its tip is 10 or 20 years old and still works like new because it is NEVER too hot.
640mV on the base is ok. 2-3V on the collector is ok. The transistor is on and doing its job ok.I get only 640mv and collector shows 2-3v so transistor is not ON.