The methods mentioned work well. Since everyone is different, some methods work better for some than others, so with that in mind, here's another way of doing it...

First: As you make your turn to the base leg, note your distance and altitude. Starting right will help you get the right altitude and airspeed at the end.

Second: As you turn to final, glance at the surroundings. Notice where your plane is in reference to a landmark. Like, "ok, I'm just over that tree on the horizon". If you come in across the runway toward you, next time try turning just PAST that tree on the horizon.