Advice on handling a defensive baby Suriname?

I know that I need to handle her for her to get used to me but when I try to pick her up her hissing scares me more than her bite (she gave me a nip last night) but I'm not worried about getting bit as small as she is

But its the fact that she's obviously stressed when my hand gets near and I don't want her to be stressed

Should I just pick her up anyway for a few minutes and eventually she'll just get used to it? But that leads to the next problem which is anytime I do get her into my hands she's pretty cool for a minute or two but then she tries to get away out of my hands, pretty fast actually

First time boa owner, any advice would be awesome, thank you everybody