What is bias a tube amp ? Is it difficult?

When I was toying with the idea of moving over to the tube side, just the thought of biasing with a meter, turned me off completely to the idea of tubes. Getting down on the floor with a meter, checking, obsessing over my tubes? Forgeddabout it. So, I go for a self biasing integrated. Now, after being exposed to the beauties of tubes and becoming truly addicted to the tube sound and if I had the opportunity to purchase a tube amp (that required self biasing) to die for? I'd get down on the floor with my meter and bias away. warren:)

BTW, my SET seperates are self biasing, thank god.

I don't understand auto biasing vs manual biasing? Why wouldn't all tubes be auto/self biasing? What is it about the nature of an amp, or the manufacturer, or whatever, that one would produce an amp without this feature? thanks in advance, warren :)