The most important aid you can have in learning to fly is an instructor, a good additional aid is a simulator for those rainy days when you cant get to the field. It is not impossible to teach yourself, but unless you are exceptionally gifted, the process will inevitably result in many hours spent repairing broken models. An instructors guidance will not necessarily prevent the occasional accident, but will increase tenfold the chances of bringing your model home in one piece at the end of the day, and his experience will be invaluable in reducing the time required to reach a solo standard.
An instructor will also pre-flight check your model carefully to ensure that everything is secure and that control surfaces are working in the right direction, a habit which all pilots should get into right from the start.
The traditional arrangement for instruction is for the instructor to get the model airborne and trimmed into level flight, then hand the transmitter to the student. The instructor will then issue instructions to the student to help him control the model.
If the student gets into difficulties the instructor takes back the transmitter and regains control. The delay caused by the physical transfer of the transmitter box can sometimes lead to problems if the model is at low attitude when difficulties arise. This can be overcome by using a dual-control system known as a buddy box This allows 2 transmitters to be connected together with a lead, and the master Tx has a switch on it which when held down transfers control of the model to the students Tx. In this way the instructor can allow the student to carry on flying the model even into unusual attitudes yet regain control immediately when required.