I read an interesting thing, can't remember where, suggesting that one really helpful strategy is to make a real point of praising trying/ hard work RATHER than success/ cleverness
So, 'wow, that's a great drawing, looks like you really worked hard to colour that bit'
rather than, 'wow, you're so good at drawing, aren't you clever' etc
The rationale being that a child who's praised for their cleverness can be really scared of failing and therefore cutting off the reason they're loved, iyswim, even if you don't act all disappointed when they 'fail'
Have started doing it with mr perfecto ds1, and it does seem to have taken some of his terror of trying stuff he might not be able to do straight away; he's another one who's very able at a lot of things, and has maybe got a lot invested in his self-image as a 'clever boy'