Of course. At Spanish Pronunciation Academy we teach all the elements of Spanish pronunciation: prosody and sounds.  The vast majority of people succeed. Alexandra has been teaching speakers of different languages for more than 6 years how to vibrate the tongue more and less intensely in order to produce the two Spanish R's. In addition, she knows perfectly well the activities and exercises to fine-tune the muscles involved in the pronunciation of this sound, so she will help you in an effective way.  However, we must not forget that there are other factors that influence success: language movement problems, psychological barriers, lack of practice, lack of continuity, motivation, etc., which must also be taken into account.