Don't listen to the naysayers Anthony. If you do exceptional work and search out the right market you can earn good money for your efforts with a
balanced portable system. I do quite well but you need to have the right equipment. You'll need a scrubber , either A 175 swing machine or a
CRB. Check Craigslist for both. A host machine will suffice quite nicely and they're usually quite reasonable price wise. The 175 has a pretty big learning curve so if you get one, take the time to practice with it I strongly suggest a 500 psi with parallel 3 stage vacs. If you can afford it, an inline heater is great. I use a 3250 watt kleenrite heatrite. It does add some extra plugs but it won't take long to figure out standard wiring. An injection sprayer is a good idea as it will be easier than a pump up. You'll need a handbook or a half wand to do stairs, an upholstery tool for furniture. You'll still need things like tabs,spotters and sundry.
Take some courses. You'll learn the what, why and when. Although I'm not a big cheerleader for the
iicrc, I don't regret taking the courses. A great attitude will go a long way to your success. Take the time to listen to your customer's concerns and input and don't lose sight that it's a privilege to serve them. Be sure to follow up with them and be sure they're happy. If they have a problem deal with it quickly. Be confident in your abilities as your knowledge grows. If you don't know, ask. There's a lot of resources at your fingertips here. Be prepared to work and work hard. I don't know many people who have a big ass print on the sofa and are successful at the same time.
Your market is wide open, but look for high rise and secure status buildings for good income. In the commercial sector work on maintenance contracts. They provide a good income stream that will stay steady if you work at it. Market the green side of electronic cleaning. Technology has advanced quite a bit since I started out with 100 psi pump and a wimpy vacuum system. As you grow, think about hiring a helper. A well trained team can cover a lot of area in less time. And it can be quite nice to get the time
Success is up to you, not your equipment.