How god re your eyes?????
Yep you can use them. Your boards will have to be designed for them or you can make (preffered) or shudder the thought buy adapters for the little gremlins. Life is easier with the right equipment but there are ways to do it.
to make an ultra small iron tip wrap some solid core bare wire around your tip and extend the coil around a couple of turns for it to stay in place. Extend the new "tip" past the existing tip and lightly tin the whole mess to promote good heat transfer. An adjustable temp iron is also good if not esential. If you don't have this maybe a variable transformer or even an appropriately mounted light dimmer from home depot or where ever.
Next very thin solder, good paste or even better solder paste.
An illuminated magnifying lamp is good for us squinters. A very adjustable hot plate is good when you are doing larger jobs because it alows you to preheat your board to just under the melting point of your solder and you can work more quickly.
One big caveat.. HEAT KILLS so you need to work fast and face the cruel hard fact that you are going to kill something some time when you are starting out. But it gets better  with practice 
Mark
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thanks.i'm kinda new in this.
