One comment on crimping and soldering, there are many different approaches and specifications as to solder or not solder. In general, if you use high quality crimps (alloy copper or brass), a proper crimper and size the wire according to the crimp size, you will break the wire long before you can pull the wire out of the crimp. Different connectors require specific crimpers to completely squeeze down the wire so there is no void space. Some of the better crimps have an inner and outer crimp shell of different alloys, I tried to get the wire out of one of these and wire was fused to the crimp metal. One of the biggest problems with the inexpensive crimpers is void space, look at the end of the wire in the crimp and you will almost always see open space on one side of the wire. Never solder a wire and then crimp it, seems logical, but solder will cold flow or melt with any resistance and the wire will loosen exacerbating the heating.
Cheaper crimps are often steel, and do not flow or compress around the wire vs. a copper/brass alloy crimp. In the aerospace industry soldering crimped wire is a no no, main reason is that it does not allow the wire just behind the crimp to flex and will fail much sooner in a high vibration or movement environment. That being said, in the marine or a corrosive environment I have seen crimps fail due to oxidation. The Coast Guard bulletins on the subject recommended crimping then soldering in certain applications. In some cases some form of strain relief is used over the crimp and extending onto the wire to decrease bending and prevent corrosion getting into the crimp.
I have evolved my crimping technique based on experience (failure) and practices for different industries. If you are going to do more than a few crimps, invest in a knock off decent crimper (about $50-80) that has different size dies, get decent alloy crimps that have nylon insulation (vinyl insulated crimps do not crimp well, nor handle heat and usually fall off), and consider using some fusible heat shrink to provide some strain relief. After you crimp, you can solder the tip of the exposed wire to prevent any corrosion getting into the crimp. On high voltage (120 and above) I crimp, solder the wire tip and use fusible shrink tubing over the crimp. Soldering is controversial in this application. Also when making bare wire terminal connections with stranded wire, do not solder the wire, as the solder will cold flow and the connection will loosen.