Hi!
Silver soldering with an electrical soldering iron is quit simple.
But remember that all soldering done when it comes to practical landing gears are mostly done by winding thin copper wire around the piano wire prior to soldering and then heating the wire and applying solder.
If your'e going to sweet solder (The best metode) use Great Planes silver solder. This is the best sweet soldering material available. I have used it for 32 years and are very satisfied with it.
You should not use brazing (using a propane or acetylene /oxigen torch) as the heat softens the piano wire and is impossible to restore its flexibility (at least for us mortals).