A few ways:

- first, focus on your health until you are as stable as you're going to get. This means eating right, exercising, not doing drugs, minimal alcohol, good mix of meds, and so on. The goal here is to get to a stage of life where bipolar isn't really that big of a problem.

- second, find a job with a stress level that you can handle based on how stable you are. If a job is outside of your limits, it won't work.

- three, remember that work experience, even if slightly painful, builds character and strength, and that if you take a new job you will become better at it, and more adapted to it

On the whole it's better to push your boundaries within reason, but know your limits.