HI Herbs,
I have B Vagans, B. Albopilosum, B Albiceps, B. Boehmei, all ranging from 4-11 cm, and I handle all of them. The B. Vagans is about 5-6 cm, its usually kind of skittish when in its enclosure, once I have it out, i handle it with no issues. Yet I do know that attitude will differ from one individual to the other. IF it does actually bite you, prepare yourself for what I would imagine is inferior to that of a bee sting (at one centimeter even less, if you will even know you were tagged). best is to handle it now, and continue as it grows so both you and the T will get used to it.