This step involves mounting the LED module and power wires to the thermal substrate. There is a correct way to perform reflow soldering... and I am pretty sure the following is NOT it. Therefore, I highly recommend doing alternate research as these components are the most fragile and most expensive parts of the flashlight. The following does seem to work for me, so if you are feeling brave, proceed at your own risk... You could also probably buy pre-mounted LEDs... but that may require modifying the Lens Bushing/LED Cap..
Step 1: Strip/tin 1/4" of one end of each wire
Step 5: Turn on stove to medium heat and place thermal pad in frying pan/skillet. Watch closely and remove thermal pad when the solder paste melts. Depending on what types of solder/solder paste you use, you may be able to use the melting of the regular solder as an indication that the solder paste is about to melt.