Actually,

This is the busy time of year for FSDO GA Inspectors because March is
IA renewal season. AC 20-27 has excellent guidance on getting your
homebuilt/experimental certificated. Available at www.faa.gov,
navigate to the Advisory Circular page and search under AC's by
number. EAA.org is another excellent (certainly the best?) resource.
Your local chapter will be very valuable and knowledgeable on getting
these things done in your locality.

As stated above, DAR is the easiest way, but costs money, FAA is free,
but there may be a wait, especially if you're not located near a FSDO.

Jim