I did this.
Did an NVQ II in Bench Joinery at the grand old age of 31 and swapped career. Booked into my local college and was planning on doing an ICT in Joinery (non voccational) the got made redundant 6 months before 2 year course finished and very luckily got a job in a boat builders as a joiner and they allowed me to do all of the vocational stuff at work. Ace.
You will never stop learning, every day is a school day. I make doors, galleys, lockers etc in multi million pound yachts, a lot of ply and veneers. But quite a bit of Teak work.
As a hobby I have made 2 guitars, which is where my heart now lies as a true career, but mortgage commitments dictate otherwise at the mo.
Hope this helps, if not ask more.