I want to do the same. Simply because I don't enjoy my job. I'm a mechanic, the pay is good (because i do hgv's), the hours are good and there is plenty of work but the motor trade sucks!
I always loved motors so persued an apprenticship after i left school. Not because i was thick, got decent grades an all.
I want to make a career change too but just don't know what i'd enjoy doing.
My advice would be to find out exactly how your new career would be on a day-to-day bassis. Coz its half the battle if you enjoy it.
May sound simple but but hey.