Some very encouraging feedback at the Winchester Writers' Conference has boosted my confidence, and reassured me that I've not been wasting my time. I now have a month or so to relax before the Agent process begins in September.
In the meantime, I intend to follow Stephen King's advice, and leave my book alone for a few weeks before I do any more editing. This will give me time to make a dent in the tower of books, and the pile of DVDs that have been mounting up recently.
But today, I have a huge smile on my face, and I intend to celebrate in a manner that befits completion of a first novel. Cheers!