Welcome! 4 years ago I was in your same position, I’m lucky to work with @Neuhaus_Metalworks so I have a much better understanding of building and access to bigger machinery.
These two videos posted on the Seen on the Web thread have been inspiring to see how simple you can build a bike.
and @PC56’s setup:
To me, the chainstay sub-assembly - the dropouts, chainstays, tire clearance, and chainstay length is the most difficult part of the bike. What frame details are you looking to do?