Personally, I don't think it's neccessary to go out and get experience handling other large snakes before getting an Anaconda. I mean, as long as you don't buy your snake as an adult, you will have years of experience handling that individual snake by the time it reaches what could be considered a dangerous size. That said, experience with other people's large snakes may help you decide if caring for an animal that size is really something you're going to enjoy.