How do we know how much we can take on, those of us struggling with Bipolar Disorder?

My kids are older now so they still need me but in a different way- emotional support, being a role model and rides basically. Oh yeah and food, clothes etc.

I want to start doing things for myself now. Like classes or go back to school full-time.... but could I handle it?
Would everything fall completely apart at home?

I always have this problem- how much can I take on before too much stress triggers an attack. Do I live a laying-low kind of life- like work part time and have a hobby or do I push myself hard and get my degree or job with more responsibilities? What is a low-stress life and is it boring?

Anyone else struggling with this?