There are a number of tutorials available on the internet with instructions on how to DIY your own audio guest book.
You can expect to invest several hours of your planning time to sourcing materials, building the device, coding, troubleshooting, and getting everything ready for your event. Technical skills and familiarity with coding and electronics are also necessary. In the end, you are still left with a device that may not function the way you would hope.
Why not invest your DIY wedding time into creating other elements for your event? With FêteFone you have an all-in-one, off the shelf audio guest book solution with years of experience and expertise behind it.