i would say:
1 - keep feeding it so it learns that you mean food, by that i mean only you feed it no1 else!
2 - spend some time each day near to it so it comes to learn you do not mean harm
3 - maybe get another tamer one and it will learn (from the new one) that not all humans are evil!
4 - stick with whatever you decide! it could take months for the smallest breakthrough! and i would say stick to a routine!
we have a rescue cat that was given up by its family, last night was the first time (in nearly 8 months of having him) that he let us touch him without hissing and going to scratch us! he has bonded with our siamese stud boy a siamese kitten and our oriental girl. he has changed over night (literally!) from a hissing spitting ball of hate into a loving friend to the other cats and is accepting that we dont mean him any harm etc i imagine a llama could do you some quite serious damage espically if it dosent trust you so be careful when trying to tame it up. my partner and i have both been gotten (by our now docile rescue) on several occasions and blood was drawn! im sure others on here will have some more advice for you!