The course for carpet cleaning Prochem Chessington is £90 (last I looked)
It was of the same quality as the NCCA one which was £300 odd but that was 2 days including upholstery, the carpet bit is the same. Obviously Prochem will push their products, which I felt was helpful because choosing products is another mine field. Prochem carry a good range and its helpful that they show you them in practice.
I still use Prochem after dabbling with others.
Forget about your free time, you will be working 24/7, might not actually be cleaning but you will be absorbed in your business non stop. Late at night and on weekends. Especially if you do it all yourself including the marketing. However it doesn't really feel like work. The first couple of jobs will be back breaking and disheartening but then you'll start to slowly figure things out. And you will still be looking at your computer screen... a lot
Be wary of suppliers, they all push their own agenda's it will be up to you to decide what works best, don't hammer away trying to make a product work because supplier X said it would. When I was looking to buy my first machine some guy was pushing me to buy a Sabrina Maxi even though I had enough money for a bigger machine. He only sold Sabrina's.
I would start your marketing research now while you are still working full time. I started marketing my carpet cleaning business 6 months before I even picked up a wand, I wouldn't have started unless I was confident I could earn the same as my full time job. When I got calls I just said I was fully booked, about 4 weeks before I left my job I just took sneaky days off to do a job or two. The first carpet I cleaned was still one of the best results I ever got, double bedroom and stairs 4 hours
£50. Then I did an end of tenancy 4 bedroom. 7 hours of hell £250. Now I'd do it in 2 easy.
I've been going for 2 years now, still waiting for the easy life