The snakes are not poisonous, they are stranglers. So I do handle them a couple of times a week. They never get "tamed" though, but by handling them every now and them you condition them to no longer consider you a threat.
With specimen over 2 metres though you still have to be careful, for you'll never be able to measure up to their strength.
All tarantulas are venomous, though there is a difference between "old world spiders" and "new world spiders". The first ones come from Asia and Africa and have only one defence mechanism, their venom.
New world spiders are from S-America and have urticating hairs as primary defense mechanism, so their venom is less strong.
I only keep those new world spiders.
I usually do not handle them, only the Brachypelmas when needed for maintenanace on their tank.
The stirmis have very nasty urticating hairs and are very defensive, so not meant for handling. Even though their venom is not that strong, the damage they can do with fangs of 2cm is not to be underestimated...
Besides, I'm an arachnofobic, so handling spiders that could fit over my face is something I'm not even going to try
The scorps are not that venomous either, but I handle them only by grabbing the tail with a clamp, so the stinger stays away from my hands.
In general, arachnids are not species taht should be handled unless absolutely necessary. It brings a lot of stress top them (and the keepers).
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moi qui n'y connait rien dans ce domaine ! 
, if you want to put pictures of your small caiman you can do so 
