Hi, I have been working on changing my embouchure for the last 6 weeks with guidance from a private teacher. I have gone from a very off center placement with very little top lip to a center placement. It feels very comfortable and although I have been making progress with developing tone and my lower register, I have seen very little improvement in my upper register since I started - I can't get past an E on the top space of the stave and even then I'm using too much pressure. I have been working on all the fundamentals - lots of long tones (in my comfortable register), lip slurs and scales. Can anyone give me any guidance on whether this is completely normal or suggest any further exercises I can do to see an improvement? I have been working hard every single day and it's beginning to get frustrating to have not seen an improvement. Thank you.