When I think of fire spells, I really think of manipulating fire with your own energies. It does take a lot of practice and concentration (just like telekinesis), which often requires that you be in a nice comfortable and open space that is quiet. There could be spells to enhance the ability to work with fire in such ways, of which have probably worked for the user.
Not that hard. It just takes time. It is a skill that you develop, like making psi balls. Meditation helps you focus your energies and get them to do what you want them to. I highly recommend you meditate before working with fire.