Seems to be a lot of shyness out there Karl......what would help in your situation, is to let the board know where you're located and what you're hoping to do.
We're an opinionated lot, some from experience, some from brand, or providor loyalty, some due to financial outlay, some........just think they know better !
My personal opinion, is, don't get caught up in all the hype.
As you don't know whether you will be suitable for this occupation and many are not, but do it anyway, look around for a secondhand machine which will give you the opportunity to learn and practice.
You would save a lot of wasted time and money if you attend a one day introductory course. There are several of these on offer around the country and go for the nearest to home.
You will even find divided opinions on which secondhand machine is capable, or otherwise of doing a reasonable job, but you won't be an overnight expert and a simple portable, with as little as 70 psi and single vac will allow you to experiment and practice.
Ideally, you should have a carpet wand and upholstery tool with the machine and a powder detergent will be adequate for most jobs.
Some will suggest the above is nonesense and you must have massive power and the latest technology to succeed and be credible, but ......
I disagree and suggest you spend a little time learning.
good luck
r m