you'll be fine as long as you're consistent. that's the bottom line.. be fucking consistent until you're making good money. no fucking around. work out hard every day, and work hard every day, a solid 6-8 hours. some dickheads around here will tell you to work 12-15 hour days, no, 6 hours of fucking good, solid / quality work is all you need; otherwise you'll get burnt out in the beginning.
the working out bit is to relieve the stress and anxiety you'll naturally receive by being self employed. that's why so many here get fucking panic attacks.. they don't get the stress out any other way.. exercise'll do that for ya.
just my 2c.