There are many facets of learning an accent. There are the phonetic substitutions (the replacement of one vowel or consonant sound with another), shifting of placement of sound to different areas of the mouth, changes in rhythm, and pitch, and even attitude from one accent to another.
My style of coaching is based on how each individual student learns best. Some students prefer to see the phonetic sound substitutions on paper, and some like to be able to feel the change in their mouth when shifting into the accent. I am very good at picking up on how a particular student learns best, and teaching to that, while not ignoring the other facets of the accent.
Learning an accent is like any other physical activity, in the fact that you will build muscle memory. The more memory you build, the easier that accent becomes. As you learn to feel the different parts of your mouth and become familiar with how sound shifts from one area to another, each accent will become easier than the last. It is the same with phonetics, the better you know it, the easier the learning becomes.
Most importantly, I teach that the accent should never impede a performance. As an actor and director I know how important truthful delivery is, and I refuse to let an accent override a performance. An accent should help inform a performance not hinder it. With my coaching method you will have the confidence and comfort level to forget about the dialect and just go out and play.