If possible, make copies of the piece for everyone (note: please be mindful of copyright issues before doing so!). Imagine everyone walking home with a sheaf of tunes and perhaps even collecting them into a "book" of warm-hearted music to drive the cold weather away--memories of a marvelous time, gifts from your fellow harpers.
Try this: Say or think the word "winter". Off the top of your head, write the first five words that come to mind. They could be images, feelings, actions, whatever. Now think of five more words. Think and write down five more.
Now go to your harp. Pick a mode or simple chord progression, something that suggests 'winter' to you. Lydian mode, the "more major than major" scale is interesting and unusual. If your harp is tuned to the Key of C, you will find the Lydian mode on the series of strings that start on F (F G A B C D E F is the scale). While playing an F chord (F C F) in your bass hand, noodle around on the F Lydian scale with your melody hand. Circle around the fourth step of the scale -- that whole step interval between the third and fourth degrees is what gives Lydian its distinctive character. Our Western music ears will want to change the B natural to a B flat! Explore the scale and noodle to your heart's content. Get dreamy about winter. As you do so, you might want to chant one or more of your winter words. While playing your F drone and melody noodles, you might say or sing: "Snow ---- sun --- fire -- music --- return ..." or whatever. Lose yourself in the winter magic. Improvise vocally. You may find yourself creating your own chant or song!
It is marvelously cleansing to burn, destroy, or give away something that has been dragging you down. If you just can't bear to burn that piece of music, you could just give it to someone else who might truly enjoy working on that tune or arrangement (in this case you would write your hindrance on a separate paper and burn that). Perhaps at the Yuletide celebration we should all have a tune exchange. Each of us bring a piece of sheet music we don't want to work on, and come up with some sort of trade. I'm sure all awful tunes can find loving homes and hearts!
At the same time you come up with a hindrance, think of a quality that you want to acquire for yourself at this point in your harp journey. Perhaps you want the boldness and flair of Kim Robertson, or the rhythmic splashiness of Alfredo Ortiz? Write your dream on a piece of music that embodies that quality for you, or even attach it to a CD of music that represents what you wish to accomplish. Write it in the present tense: "My music makes people dance." Use the piece of music or the CD as a reminder or a source of inspiration. Keep it somewhere near your harp, as a talisman.
Now do something to symbolize this change in you. You will no longer be a fake harper (or whatever is your chief depressing belief about your harp playing). You now make people dance when you play (or whatever is your dream). Celebrate this inner change. After all, to imagine is to create magic. If you believe, you will become. You could line up your favorite stuffed animals and give them a private performance by the dazzling new harper self that is you. Or you could do something completely different: treat yourself to a ceremonial cup of hot chocolate accompanied by lighted candles before you settle down to your next session with your harp. Whisper the words of your dream for yourself like a mantra. You could even do this at the beginning and end of each practice session for weeks or months to come. Use your imagination, have fun. Most importantly, honor the fact that you have chosen the harp as your instrument -- and that the harp has chosen you!