The nickle does sometimes catch a bit on the perfboard; gluing something a bit slipperier onto the board, or lightly sanding it, might help.
Step 1: Break the Perfboard
After doing the layout, score and break the board. I score a few times on each side with a box knife and break over the corner of a table. In these pictures I'm making two sensors, so I've made four plates -- a top and a bottom for each. The little bit of extra board was useful elsewhere in the project.