When soldering really small pieces it helps to leave the parts whole. So, in the photo there is an entire piece of white gold wire (it was 30cm long) line it up where you want to solder it and leave the whole thing nice and long. Only cut it when you are done soldering. This makes it easier to hold and no extra snippets of wire that become scrap. The rest of the lever back is made with a round/flat nose pliers. This kind of plier does not make any mar marks on your wire. It is a critical tool!
Use a softer flame when soldering and do not concentrate the heat too long to avoid smelting your small piece into a little ball. Also use heat paste on areas when you dont want heat like stones, hinges & springs for extra protection.