Yes, after attending the practice I am even more interested in continuing with it. At the moment, my lama is on personal retreat until September, so I won't be able to talk about this until then.
What is the Lung, again?
Thanks for your help.
A "Lung" is essentially a reading transmission of the text of the sadhana. This usually involves a simple, ritual reading of the entire sadhana to the student by a person empowered to do so. This can be either a monastic, a lineage holder or even another lay practioner, depending on the the sadhana in question (in some cases having recieved a Lung empowers the recipient to confer the same upon others). Reciept of a Lung, while not "empowering" a student to do a certain practice (in a strict sense), does confer the blessings of the transmission's lineage and is thought to increase the merit accumulated via the practice.
As a side note, when I recieved the Lung for the Konchok Chidu practice a few years ago, our Lama described the lineage of the transmission as he recieved it - teacher to student - in some detail. A wonderful story. Truly inspiring. Humbling even (there are some "heavy hitters" in that lineage).
Of course, in your particular case, with the Green Tara practice, Lung is optional. You need not have recieved the practice's lung in order take part in it. If your Lama is not available to give the Lung until he/she comes out of retreat in September, don't sweat it. If you feel a connection to the practice, continue without Lung. When your Lama returns, ask for the Lung then if you still feel stongly about it.
Don't concern yourself too much with the mudras used. They can be difficult to remember (as in the 8 offerings mudra), or to form (as with the so-called Mandala Offering Mudra). Mudras aren't, or at least shouldn't be a requirement of the practice. Get a bit more comfortable with the text and melodies, then go about about learning and including Mudra in your practice.
I hope that helps.