One of the best parts of being autistic/ having aspergers is that as my mum says to act we are able to litterally become someone else, that's what you have to do. Ive been unfortunate in all my auditions because I've never known what I was going in to before hand- yeh you can probably see how that went so badly- but since you know your character try and become them, live as much in that lifestyle as you can for maybe a day or two before, possibly write bits of a diary or something so you have the chance to be really prepared. I've had the misfortune that at primary school my teachers knew my potential but for other auditions I got too nervous. Take something lucky, if you have one and make sure you try to look at he people auditioning (tip. Learned this for school talks, change your gaze every sentence if there is more than one person to look at- this makes you appear more confident)
And good luck, would love to hear how you get on!
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~Pixie~