When your soldering the hotter the better for the iron, if you have a low watt iron it will take longer for the wire and the tab to warm. The heat will then move through the wire and could damage your esc.
Use flux aswell if you have some,the solder will take quicker.
As for the servo,center if first,then put the horn on before fitting it. That way you don't have to keep taking it in and out of the car.
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