Great replies from all the shop owners here. Check out Carm's podcasts as he showcases shop owners and their advice. "Remarkable Results Radio"
Ultimatley if you want it go for it. Also understand that Owning your own business is a lot of hard work. It will test your patience, your strength and wits. Being an entreprenuer is hard! This is why not a lot of people go into it or quit after some time. My advice is do not ever give up. Make it happen, learn as much as you can and continue learning and again never give up.
I started my business from a pick up truck full of tools, i was 19 years old then. Now i have a thriving business married 3 kids great employees, weekends off and stable. This may noy be considered much in reference to others peoples successes but from where i came from...its a success nonetheless.
Goodluck with your choices in life and may you reach what you want to attain