More often than not, I do DIY by myself. That is usually what I understand DIY to be defined as being.
If I'm feeling oddly like making some kind of Clapton wires I might use 24/26 awg for core wires, 34/36 for wrap.
A standard single strand wire build I might like using 26/28 awg wire.
Reckon it's subjective to what you desire doing.