It can definitely be difficult trying to make significant progress on a side project while working a full-time job. I usually try to plan out my day after work and get whatever chores done that would get in the way of me being able to come back, eat, and spend an hour or so relaxing before starting on my side project. I try to spend 1-2 hours of solid, focused time working on my side project (which is often difficult if I'm tired).