On training of your Tarantulas, I don't think you can train them per-say, just get them used to being handled.
But the main key is how you get them to get onto your hand or out the enclosure, once a spider flicks hairs, gives you a threat pose, or bolts to get away or shows it's fangs then you now you have down something wrong and the spider is upset, scared, wants your blood or just not in the mood, increasing your chances of getting tagged or uitracted hairs in the face.
It's easy enough to hold any Tarantula just like going out side and picking up your True spiders, there intend is not to bite you, but a wrong move from your part just might change that happy go lucky spider that it bites you.
I have handled all my tarantulas in my collection from the most aggressive to the never ending uitracting hair flicker,(always done this outside on the grass and once the spider is out its enclosure) In the back of my mind I now there is always a chance that the tarantula being handled on the day decides to bite you, takes off due to getting a fright, Whatever happens that day is not planned.
But I can say, My girlfriend holds her spiders she takes them out picks them up and even spoke Baby talk to them,

loved them, (I think if she could of hugged and kissed them she would of.) :whistle:
Her spiders are calm, cool and collected never flick, never show signs of aggression.
My spiders on the other Hand don't get touched the only time they get touched is when they get moved into another enclosure, and I use a paint brush.
But I think it comes down to the owner, If you want to make a system like this I think you should give it a try and do it,
Keep records of everything you do even record your findings there are people out there that love to hold there spiders and if your system works, to make it allot easier to achieve this goal them cool,
But as you said
Robert wrote: When I was a kid I had two Horned Baboons. From what I have now read, they are not easily handle able. Nowdays I have actually developed a bit of a fear for some of my T's, and part of that was the opinion I had created about their behaviour through what I had read.