Education in the UK is so bad now that few English have language skills, so BA was forced long ago to take European nationalities for their language skills. If your country is a member of the EU, there will be no discrimination against you and no special problems getting a job with any UK airline. If you have the right attitude, you have as good a chance as anybody else, though you should realise that many apply and few are chosen.
For places to stay you can always find cheap 'bed and breakfasts'- the internet will give you many, or try the British Tourist Board. Flying to the interview with companies like Ryanair can get you to the interviews fairly cheaply.
Don't feel intimidated. There are all sorts of nationalities from everywhere living and working in the UK now- you will soon find people from your area. I think there is very little discrimination, and absolutely no resentment of foreigners coming here to work. Even Flyblue has got a job here as a Moderator and we make her very welcome (it is unpaid though!).
You are only alive once. Do not be intimidated into not doing it because you think it will be difficult. I've worked with all sorts of nationalities and people seem to get on just fine.