Prepare the header strip:
Cut two strips to length if necessary. It will be easier to solder if you insert it into a breadboard - long pins down
Add the breakout board:
Place the breakout board over the pins so that the short pins poke through the breakout pads
Be sure to solder all pins for reliable electrical contact.
Solder one side of the board at first
(For tips on soldering, be sure to check out our Guide to Excellent Soldering).
If you're planning on programming with an FTDI or console cable, it's handy to have 6 pins soldered on the end for plugging in.
Cut another 6-pin strip to length if necessary. Insert it into a breadboard - long pins down