Paul Gruber goes through the Pronunciation Workshop's American accent training method of teaching you how to properly pronounce words containing the consonant 'R', with an American accent.
Two things to remember when making an American ‘R’ sound:
• Your mouth and lips come forward, like you are going to kiss.
• Your tongue moves back in your mouth, NOT forward.
Much greater detail of the consonant 'R', including many more example words and sentences, 'R' blends and detailed instruction on how to pronounce the consonant 'W' are covered in the first session of the Pronunciation Workshop's video training course.