In this video, I go over the process of installing macOS 10.13 High Sierra Public Beta on an unsupported Mac. The process is relatively easy, and is nearly identical to the method of installing Sierra on an unsupported Mac, using an updated version of my macOS Sierra Patcher tool.
As for compatibility, this works on any machine that the original Sierra patcher worked on. High Sierra did break some things, such as battery status and trackpad support on some machines, but the tool will be updated with new fixes and patches as they are developed.
Everything you need can be found here: http://dosdude1.com/highsierra