The question of prognosis with bipolar disorder is often difficult to answer in the early phases of the disorder. Each individual's experience with bipolar disorder is unique and thus each individual's future is impacted differently. What we do know is that the earlier the point of onset and the more unstable the early course of the disorder, the more unstable will be the longer course of the disorder. The flip side of this is that if the early course of the disorder is mild, then the longer term prognosis is fairly good. This phenomenon is referred to in the literature as "the kindling effect".
A significant implication of the kindling effect is that it's important to do everything in your power to make healthy life adjustments early on. This involves elements such as developing a stable healthy sleep pattern, refraining from use of psychoactive substances, maintaining consistent daily routines and becoming excellent at your own stress management. These are all important components of living well with bipolar disorder.
Unfortunately, you don't have the luxury of saying "I'll deal with implications of my disorder later. For now I just want to live life without worrying about lifestyle adjustment." By the time you get around to addressing a healthy lifestyle, the acuity of your mood variability may have already progressed to a degree where it is difficult to reel things back in.