From your experience, what is it like to balance part-time studying with full-time work / other full-time commitments?

I want to start studying, possibly a diploma, in sports and fitness and I want to know how people find it with balancing other aspects of their life. I work in hospitality full time in a hotel and think it would definitely be a bit of a challenge and just want ti get a rough idea. I already know it would be a big commitment