CantankerArt

Hi, Just wondering if anyone could tell me how to change an animation for one particular spell. It's a spell added by a mod but all im trying to do is change the casting animation it has (standard vanilla two handed) to the ritual/master spell animation. I dont normally use forums and have googled the life out of it but to no avail - or none that i can comprehend at least. I have the creation kit and a very, very limited understanding of how it works. Thanks and hope this is the right place for this question. And sorry if this has been answered before- again, havent managed to find anything.