Soldering for beginners.

  Legs are removed with nippers. After installing and startup, wash the board with spirit. I don’t recommend you to use acetone; you may break some details and wires. Don’t wash elements containing mechanics, such as relay switches, toggle switches and trimming resistors. You should install them after washing.
  I recommend you to make experiment on a bread board. You can see it at the picture.
 

  Choose the needed position for details. Cut board piece of needed size and solder components into it. Make connections with small wire. Don't forget about overheating. Work accurately and attentively, try not to short circuit the neighboring contacts. It can be useful to check lanes short circuit with a tester and sometimes you can see it on the light.

  Learn and train.
  And you’ll spend “great” time searching for the wrong connection!
And in the end I’ll tell you how to unsolder the detail from the board or how to remove short circuit of chip's bond pad.
 

  You’ll need a piece of copper sleeve from imbedded wire. Put sleeve to a board, drop flux, solder it and solder alloy soak up in it.
 

  Then dangle all legs with a pincers and remove the detail. There are special machines for exhausting copper, but I like this variant.
  Good modding to you, SilentMods.com