I started out working a full time gig and working part time. When the part time was becoming a problem with my family. I was given the ultimatum Family, Full time ,part time. I could only choose 2 so I quite the full time.
Buy plenty of tools while it's a part time. Keep your family floating off the full-time. Don't go into debt. You can see a lot of guys around Nov and Dec selling tools because they bought them in April after tax time and lost the job. Now their wife is saying how are going to pay for Christmas.
I'm an electrical geek. I have a shop full of tools. Mill, lathe, plasmas , gas drives, tigs, migs, sticks. 90% where paid for before I went full time. I turned wrenches and played machinist years. So when I started out any work was fair game. I'm a tool-aholic.