Building your own homebuilt aircraft means dedicating a huge amount of time, perseverance and resources into your personal project. Do not think that this can be done without too much trouble, it will not. It will take a lot of effort, time and dedication to finish.
After your project is finished and knowing that you are the one that has built this with your own two hands, the smoking start of the engine running for the first time, initial taxi and test runs and then the exiting first flight before flying off between the clouds into the sunset...makes it really all worth your while!
The FAA has published a document which describes the certification process and operation of amateur-built aircraft in the US, but its a good read for anyone wishing to build an aircraft.
Certification and Operation of Amateur-Built Aircraft in the United States.
Excerpt from the document:
"This advisory circular (AC) provides information about Title 14, Code of Federal Regulations (14 CFR) part 21, Certification Procedures for Products and Parts, § 21.191(g) for the purpose of operating amateur-built aircraft."
This AC provides specific information and guidance to amateur aircraft builders on: (1) Certificating and operating your amateur-built aircraft, (2) What to do and know before building an amateur-built aircraft, (3) Designing and constructing your amateur-built aircraft,
To continue reading see the pdf below: