Need guidance: How to start a business while still working a full-time job?

I would agree that starting a business and keeping it going is a process, but also has to be a labour of love to justify the extra time and effort needed to be successful. 

One thing I would add to what Roger said, is also to consider the types of customers you are targeting. At 6 years in I would say I am still somewhat early days haha but in my earlier days I built a relationship with another business that deals in lots of the small jobs (in my case as a plumber/gas fitter that meant replacing peoples faucets and toilets) simple in and out like Roger is saying, quick money. This one relationship was enough for me to make my transition to my own business. Even though the pay for it hasn't always been top end, it has been good in that it has been a consistent source of work and I have also spun off a bunch of other jobs from it. Getting in front of those people for something small and demonstrating your knowledge and personality positions you well to make jumps to something bigger with that customer. Quick example that comes to mind, I turned a $150 job into more then $10k in work with 1 customer. Bottom line would be to explore options to work with businesses that may need your service on an ongoing basis, and that can help make something that feels risky, not risky.

Well - Roger pretty much summed it up , not sure what more anyone  can say following that type of info he just gave you.

Here’s the reality: you don’t quit your job to start a business—you earn the right to quit by proving you can get customers first.

What you should do instead (practical path)

Build income on the side first (non-negotiable)

If your current job blocks your schedule, you still have:

• Early mornings
• Evenings
• Weekends

That’s enough to validate demand. You don’t need 40 hours—you need consistent paying jobs.

Focus on quick jobs, quick cash, not perfect branding.

Get your first 5–10 jobs manually

Forget fancy marketing at the start. Do this:

• Post in Nextdoor / local Facebook groups (“We’re working in your area this week…”)
• Reply to people already asking for help
• Knock a few doors where work is obvious
• Ask friends, past contacts, coworkers

Your only goal: prove strangers will pay you.

Stack cash, not risk

Don’t quit until you hit at least one of these:

• You’re making 50–70% of your job income consistently for 2–3 months
• Or you have 2–3 months of expenses saved + jobs booked ahead

Right now, you’re trying to jump the gap without a bridge.

Create leverage before quitting

Once you see traction:  

• Line up jobs for 2–4 weeks ahead
• Raise prices slightly (test demand)
• Build repeat clients

That’s when quitting becomes a calculated move, not a gamble.

The uncomfortable truth

You don’t need permission from your job—you need discipline to use your off-hours. A lot of people say “my job won’t let me,” but what they mean is “I’m exhausted.” That’s real—but it’s also the price of transition.

You’ve got two kids. That means your plan has to be boring and reliable, not risky and exciting.