My sister said she was jealous of my daughter's flashing shoes. When my daughter outgrew hers, I took out the electronics and installed them in some adult size shoes.
Step 1: Disassemble the Donor
Every shoe is going to be different, you just have to go slow and avoid cutting any wires. Start at the edges and work your way in. I used an X-ACTO knife and a sewing seam ripper to pop the seams so I could peel back the layers of plastic and fabric.
Once I got down to the LEDs, they were glued to a hard backing fabric, so I took a large piece of this backing to be used later when I reattach them to the new shoes.
The battery and motion switch were buried deep under the insole. Again I trimmed the fabric and foam away at the edges until I could peel back the insole and lift out the battery module.