It's not tricky at all, it's easy to do. The Thyroxin method is the best, I have done it successfully on dozens of occasions. I've even won an Aquarium Society of NSW show in that class (many years ago). They can also be naturally morphed by lowering the level of their water over a period of time but it's a slow process and a pain in the **** to do.
Japanese Fire Newts are also easy to keep. You need a good secure lid on your tank as they can and will get out and walk across your carpet, dry out and die. Trust me, I know.