This video blog (vlog 14) discusses progress. The usual expectation when taking piano lessons is that providing you put in the practice time you will constantly improve and this is usually true. However, occasionally you will reach a plateau and it may take a while to progress beyond this point.
Publications
Melanie Spanswick has written and published a wide range of courses, anthologies, examination syllabuses, and text books, including Play it again: PIANO (published by Schott Music). This best-selling graded, progressive piano course contains a large selection of repertoire featuring a huge array of styles and genres, with copious practice tips and suggestions for every piece.
For more information, please visit the publications page, here.
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Melanie Spanswick 
I’ve put in what has added up to week after week of practice in six whole years and towards the end, I felt I was on a constant plateau, not learning anything in terms of playing and becoming more and more disenchanted and unhappy. The fact I go to as many recitals as I can (and enjoy every single one) makes me even more disenchanted and unhappy that I’ll never be able to play the piano. Sorry to be negative but, in the words of pianopop king Bruce Hornsby, that’s just the way it is…