Totally agree with the above, if you really want to gain training in a particular field then I would also suggest doing it alongside your current job. It will take you longer to do (possibly) this way but you won't be taking the risk of not being in work while you train.

As for experience, its always a hard one - employers want experience, applicants can't gain due to not enough experience & employers not willing to take on. Knowing people in the industry always helps, get networking, talk to people in the particular field of work your interested in, ask to pop in and see for yourself what goes on, this can also be useful if for interviews as you can say 'I've done my research, ive been shadowing/talking to person x in company A. If it's plumbing, im sure colleges will have links/know of companies locally and you may beable to use their links to obtain experience once qualified. You will need to be patient along the way and the money may be slow at first, which is why it is important to try and continue your current work until your desired work picks up enough to leave your current work. Some people go part time whilst still training.

Not sure how relevant that was but hope it helps