I've spent quite a bit of time reading the guidance offered by members of this site. I've followed the 'golden rules' and ordered my first rep from a TD. If anyone's interested in how it goes I'll keep you posted.
A big thanks to all who share their knowledge and experience here.
I've done my research, I know not to pay more for a 'Swiss' movement, I've chosen my TD (Andrew AKA Trusty Time), I've chosen a simple watch (Explorer I 37mm , yes I know that's 1mm too big).... now to see what arrives. Here's hoping.