As an amateur/experimental aircraft repeat offending builder, it is my opinion that tenacity is a far more valuable personal trait than technical prowess.
When I first commenced building I was told by an experienced builder that for any mature model of aircraft kit sold, 1/3rd were flying, 1/3rd were under construction and 1/3rd were abandoned.
The two finest examples of the Vans RV6/7’s that I’ve inspected, were completed by builders without pre-existing technical skills….but they both possessed a keen “eye for detail” and were totally committed to the finishing the task. After 1,500-4,000h of hard slog, it’s reasonable to assume that completing builders will acquire and develop the technical skills and knowledge.
So my advice to a prospective aircraft builder is to critically assess yourself. If you tend to chase after every shiny new object and have a collection of unfinished projects in your garage, then do yourself a favour and buy a flying airplane.
If however you’re prepared to launch yourself “once more into the breach” whenever obstacles, exchange rates, drill bits through fingers or life gets in the way and have a willingness to remake parts 3, 4 or 12 times to get one that’s right, then you’re a homebuilding candidate….but it almost certainly won’t save you money.
The joy and satisfaction that comes from sitting in your hangar and gazing upon your completed aircraft will cause the considerable cost and years of labour to seem insignificant….and before long you’ll want to build again.