My friend has two female Mexican redknee tarantulas.
When he first got them, he handled them on a fairly regular basis, and they were quite docile. However, they are now both more than 10 years old, and it has been several years since he's handled them.
The last time he tried to pick one up, it acted quite defensive, and kicked off some urticating hairs at him.
Is it too late to retrain them to be comfortable being handled?
If not, how should he go about getting them used to being held, without getting bit or sprayed with the defensive hairs?