>>Before you felt comfortable holding it? I havn't held mine since I got it..which was probably in January, but it's nearly time for him to change cages. He's about 5 inches now.
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>>I've never really felt comfortable trying to hold him because he can climb any surface, as you all know, and he's quite fast. He's no leopard gecko. 
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>>Any suggestions?
They will generally climb up rather than down or sideways, so if you present your hands as a diagonal surface, you can usually 'walk' them like you would a leopard gecko. Of course, they will occasionally take a flying leap too, so I kinda like to keep my hands just a little separated when handling them so that they sort of have a pre-designated place to leap to - the other hand.
As far as how big before handling them goes, much like leos, younger ones are more nervous, but occasional handling (say 2-3 times/week) will help them calm down faster. I'd say start now, stay low to the ground when handling your little guy so that if he does take a leap out into nothing (which young ones sometimes will), he won't have too far to fall, and you'll easily be able to recover him.
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0.1 Albino Leopard Gecko - Tigger
0.1 Crested Gecko - Pooh-Bear