1. Start along with your current job. (You have to manage your time and work very hard.)
2. Take the risk by building an emergency net of 12-18 months, and by building a skill along with your current job. (It gives you time to try, especially if your job is demanding.)
Trying along with your current job is a sureshot way to start small.
Trying by quitting and saving is a sureshot way to try multiple things.
You do you.