Experimental/Exhibition

Is there anyone here who has gone through the process of getting an
airworthiness certificate for a homebuilt aircraft as an experimental,
exhibition in group IV? I'd like to compare notes with someone who has
already done it. I had no idea what was involved when I went into it. Heck
of a way to learn... Mine's a turbine aircraft but I just want to compare
notes regardless of the type of aircraft.