Simplest self install dinghy brake system for a DP?

I'm very happy with my ReadyBrake system. Just a wire from the front of the towed to the brake peddle. I'm sure it can be self installed if your up to that sort of thing. I had it installed by a technician as I had concerns about drilling through the firewall (and missing all the important stuff there) and I really don't crawl around under the car anymore. But there is nothing technical, no interruption of brake lines and no attachment to power.