Now that we are done coloring all our letters, we will need to make them appear crooked and out of line. The letters need to look like they were "stapled" to the corkboard. The way we do that is by rotating and positioning them with the Move Tool (V) randomly and quickly. Allow some letters to overlap so shadows can be created there too. The less time you think about it the better, and that goes for this whole handmade style (you can always tweak where needed).
So use the Move Tool (V) and select the layer that contains your first letter. Click the corner and rotate the letter to the position you want and hit Enter to set the transformation. Then move the letter around by dragging it with the Move Tool (V), or use the arrow keys with the layer selected to bump it around. Repeat that process for each letter. See below for the results.