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[becsta]

i have just adopted a 3yr old Blue Tongue. he looks like he is in good condition but his owner couldn't look after him anymore. i got him on thursday night and put him in my diamonds old enclosure with heaps of hides and over the weekend my dad and i built a new bigger enclosure for him with mulch sto dig, hides, basking rock (sandstone under heat lamp) and UV light
i'm getting a little worried is it ok for him to still be a little stressed?
i had him out on Sunday night and he was very content but the last 2 nights he has been hissing at me when i attempt to get him out.
i wouldnt be so worried usually only his previous owner said he liked to come out all the time, and i read somewhere that they need to be handled regularly to stay tame/handleable
should i just wait longer? how long should i leave him by himself

any help or advise would be much appreciated