John, I'm looking at getting into selling window blinds to see me through the summer.
I don't want to spend any more than £100 on starting up the business. How do you rate my chances of success?
I'm not being arsey with you, just trying to illustrate a point

You need a lot more than even the 2k suggested to start up in this business. If you try to do it on the cheap you'll get nowhere. Let's get one thing straight - an under-powered machine will not clean ANY sized carpet very well. The size of the room means nothing.
I'd suggest that you thoroughly find out about what the carpet cleaning business is all about. Spending a good few days (yes days!) browsing some of our industry forums will open you up to a lot of intriguing and mind boggling information!
But the best way of getting a feel for it is to arrange a few days out with different carpet cleaners who are happy to let you come out with them and see how it all works. If you put up a post, you'll no doubt get a few replies. Normally the strength of response is matched to how committed and enthusiastic you are to becoming a part of this industry

Then you need to make a pivotal decision - do you want to do it or not? If the answer is anything but a definite yes then don't waste your time or your £1000.
If I was to do it all again, I'd advise the following (this is just my opinion obviously, others will no doubt have a different view!)
Put a business plan together, scrape up all the cash you can and then go to your bank manager and ask for at least £5,000. Without a business plan they will just laugh at you.
Book yourself in on several different training courses, because no single instructor will have all the answers to everything. Getting similar tuition from different people helps you understand things better and reinforces the knowledge. Training is just the tip of the iceberg to be honest, you learn more in one day on the job than a month in a classroom.
Decide on a logo or at least colour scheme. Get your van nice and tidy and
sign written. If you don't have a van, borrow more money and buy one. Don't work out of your car under any circumstances! Split your remaining money 50/50 between buying kit and marketing.
Arrange a good sized overdraft of £5k for working capital and don't be afraid if you're £4k overdrawn for a while. As a new-start, if you stop spending on marketing you'll end up sitting at home all day. Don't expect to be out of debt for a while so you have to factor interest payments into your cash flow forecast. You might like to pay yourself some money every now and again too

Sorry for the sermon, but I'm afraid too many people fancy "having a go" at carpet cleaning and they just fall flat on their face because they completely underestimate what it takes. Good luck!