Only you can answer this question. Your success doesn't depend on whether you do this work part or full- time. The success will come from identifying your end-goal and working towards it, no matter what it is. You must believe that you have the ability to accomplish the end objective you've laid out. If you lack this self- confidence, there is a better than even chance you won't make your goal.
Positive motivation is the stuff of winners.
Winners can create successful business ventures on any scale they choose. If it's to earn six figures and working at it full-time and expanding to a couple of studio locations, then aim for the goal, think positively and set the wheels in motion. Map out a game plan that includes daily, weekly and monthly objectives. The smaller your ambition, the shorter the list. But it doesn't matter.