Yeah, getting to the end of the current content requires 4 trials. The one at level 73 that youre probly at, two later in the main ShB story, and a final one during the patches. If you pass the current one, you will be able to open up every region except the last one before you get to the second trial, and the third is to end the main story. In terms of time commitment, most trials are done in 8-10 mins so kid aggro has less time to build up. But other players are going to be part of it. Im sorry you had a bad experience, but i would tell you that the vast majority of groups arent bad.