Requirement for PPL skills test is a minimum of 45 dgrees angle of bank (see CAA doc 19). I was taught to do them at 60 degrees (good fun, especially if you can hit your wake!)
If you are flying a piper, use the hinge line going down the nose. This is a great 'gun sight' for lining stuff up in turns, landing etc etc. In a steep turn aim to nail a point of the nose with the horizon.
Roll into the turn, coordinate with rudder, once past 30 dges, add some power, pitch up, add more bank until the required aob is reached. If you are loosing height, roll off a little aieleron, pittch up, roll back back on. It is very difficult to regain attitude with that much aieleron on. If climbing, slightly relax back pressure / add more aob. Don't exceed 60 degrees.
That's what I was taught anyway!
