I think the easiest way is to tin the wire you will be soldering on the GC. then all you have to do is heat it and apply to the solder point. to bridge to points you can just use a small wire and solder to each point (ive never done a GC so im not sure any other way). Also use flux to help the wire stick to the solder point. if your super worried tape off the points with electrical tape. and do not by any means hurry your self you will only drop the iron on the board ruining it

oh yea and theres some braid or a sucker you can get to take off solder incase you mess up, that would be handy as well.