Whilst I appreciate that there are other ways of doing it and that many of them are probably cheaper, enrolling on an initial course run by CTC or similar is probably as good as any way of discovering if you've got what it takes without blowing many £1000s.
Either way, if you've got what it takes and the cash to do it, it will work out for you, if you aren't suitable it will save you a lot of personal grief and cash.
At the risk of being blunt, you've got far too much to lose and a lot to gain but ultimately it's your shout.
The very best of luck to you.
