I’m generally hopeless at DIY/tool-based stuff. But just ploughed on in with my old Kona Blast back in 2006, and every bike since then has been a self-build.
As has been said, it’s an incredibly satisfying thing to do. And, most importantly, it’s not hard either. Get the right tools, be patient and go for it.
As for a frame, it depends what you want. I do love the look of a Soul or Solaris personally…