Please don't take this the wrong way and I know I am new , but.........
I would seriously re-consider thinking of 'working' for a company that will have you watching for a bit and then 'slashing down tiles'. I understand your problem with the cost of courses but you really don't have to spend a fortune, I had a bit of hard time last year but decided on a course that suited my budget and that I could pay a small deposit on up front and save for over the next few weeks/months. Whilst the shorter courses will only ever offer a basic introduction, that is a far better option IMOH than what you are thinking about doing. With what you learn there, read here, ask questions, visit a few local tile shops, talk to people,maybe do a couple of small jobs for friends and family to cut your teeth. I have a stone merchant in Brentford who is happy for me to pop along for a chat, touch and feel and sniff his stones

......ask questions(even if later,when you know better you realise how silly they are)I have put a little business his way, too. You just don't have to spend a fortune to get some initial guidance.
You are in an admin job? I guess you aren't at work at the weekends then? 9-5 working hours during the week? You have plenty of time to research and learn more and if you feel confident, tackle a few jobs. You also have the huge benefit of having an income that will support you until things work out. Maybe use some of that income to buy some seconds or returns from a local tile shop, buy some cheap addy....tile something and have fun.
I look at tiling as creative work, problem solving and leaving a lasting impression on customers-it really is art. look at some of the jobs that people have done on here...satisfying or what? Thats what I aspire to, not slashing and house bashing tiles.
Hope that wasn't a rant
redrex