Ham since '07, building a Bitx20 in '12? OK, have you built simpler in between? That should have taught you the basics of troubleshooting and given you some basic test-gear.
A Bitx2o from scratch is NOT a beginner's project!
I'd recommend a careful perusal of SolderSmoke blog: Bill N2CQR in particular is a consummate builder, returning to the simple and re-starting just for the joy of it - and Pete N2CQW doing real advanced stuff, again for the joy of it. IIRC Bill built bitxes before Farhan's kits - merely as proof-of-concept.