LAST VIDEO: I just rand across this video, it's in GERMAN, but "video languages" is the international language. Just watch and you will see what he is doing. I could probably take his video and Dub it,but it wouldn't be fair to him, plus I don't want to break any laws.
WHAT'S great about this video is he uses EC5 connectors, and XT60 connectors, the two most commonly used in our hobby. Plus this method will work with about all likewise connectors. It would also work with XT90 connectors which I use in my 1/4 Scale MD500. Well I use about all connectors, even Anderson Type solderless connectors that work great. You can even solder these connectors, and I swear they might be some of the toughest best connectors to use in certain areas.
Two things, I would use butane torch heat in some areas as it's 5 times faster, and I would use needle nose pliers a little more. I believe my fingers wouldn't get as hot as his were! Also, Flux is you best friend, BUT it must be cleaned off after soldering the connector. Just have Acetone, Lacquer Thinner, or rubbing Alcohol handy. Keep in small containers just to dip the wires in and clean off with a cotton cloth. Remember to heed all "FIRE" hazards which should be minimal for the products I listed. I use them in my career for over 40 years without one fire whatsoever, but there is always a first time. Just use common sense. I have seen the same chemicals use in other videos by professional teachers, so again, use common sense.
Take a look at this video, if you have questions, I believe I can answer most anything thrown at me. Plus I feel several others will feel the same way.
I hope this helps many out there with their soldering. It definetly helped me.
Good Luck, practice safety, Dennis