this is something that troubles me to, I work a 8 to 6 office job, do some freelance projects and try to draw/create some personal projects and i am constantly feeling like making no-progress.
the first thing i did was realize how much time i actually have every day after regular work. turns out it is a bout 4 productive hours. what i do nowadays is to focus every day on an unique task. (working on a freelance gig, learning to make videogames etc..) but only one thing per day, jumping from one thing to other is what i think makes it hard. so i put aside at least two days a week(8 hours total) to the personal projects and divide the rest among girlfriend/family/entertainment.
having deadlines, meassuring time in a realistic way i guess.