Guyt, Not to worry. That tweeter electrically is very tough. It will be very hard to over heat it. Make sure you tin the iron as it is heating up. Remove the wires from the old tweeter with the iron. Do not cut them. Re tin the ends with fresh solder and crimp them on the terminals of the new tweeter tight with needle nose pliers paying attention to polarity. Press the iron against the terminals and the wires, when you see the solder glisten add a little more solder at the junction between the wire and the terminal. It should flow right out. The whole process should take no more than 5 seconds. Your Iron should be at least 25 watts preferably over 40. A cold iron is worse than a dull knife. If you are uncomfortable with soldering just practice soldering 24 gauge wire together. If you are still nervous message me.
Mike
Mike