1. Fix the rope at the bottom like for any typical lead soloing.
2. Tie the other end of the rope to a haul/rappel rope, and tie the end of that rope to the anchor or attach it to a haul bag.
3. Attach your leading device to the lead rope like you would to lead any pitch.
4. Stack the rope so that the rope goes from the anchor, to your harness, to the stacked rope, to the end of the haul/rappel rope.
5. Lead the pitch like any solo lead. At the beginning the weight will be very low but at the end of the pitch you will have the entire weight of the second rope on your harness as well.
6. Rappel the haul/rappel rope to the first anchor.
7. Second the pitch however it is you second pitches. The advantage of this for free climbing is that you can set up a system for seconding similar to what is described in the Silent Partner manual using the lead rope as your main belay rope with your SP, minitraxion, whatever and the other rope you can tie into the end of leaving some weight on the lead rope so your self belay device will feed easier. Of course if you have bolts at the belay you can set up a fixed line by passing the tied together ropes through the bolts as long as both ends at tied at the above anchor. When you finish seconding the pitch pull the rope through like a rappel.