Advise on codewalks:
-- Make a real index card with the design recipe steps (not a piece of paper).
-- Copy the various strategies at the back of your card.
-- Copy the content of this page at the back of your card.
-- Structure your presentation around the content of your index card.
-- Make sure to answer all the questions on your index card in the order they appear on your card.
-- Add sufficient documentation to your code as a guide to your presentation (annotate your examples and tests, write the strategy comment, write concise purpose statements).
-- Bring with you your index card (I will ask for it).
-- Use it during the presentation if you get stuck.
And finally practice your talks with your partner before coming to the codewalks...