Jim
What are you using at the business end, a probe or tweezer?
I use a tweezer-like unit.
I simply grab the item between the tips, put the rosin core solder against the rail, and hit the foot switch for a couple seconds...and its done.
Other than that, you follow standard soldering practices of cleaning the material to be soldered, and using rosin core solder for electrical work, and rosin or non-corrosive flux if needed.
The other trick is to determine how much power to use. I try to use the minimum power to do the job. Too little and the heat spreads beyond the working area. Too much and you might melt the metal you want to solder. I can't remember but there was a reason for not using too much power.