I'm getting bored with this one, I'm afraid. I've no problem with the special instructions or the jigsaw format (I used to enjoy Araucaria's and use exactly the same approach as that outlined by chrise above using letter counts, etc). However, as he also said, some of the cluing is too loose to be sure I've got the right answers. Is the first F what I think it is? It's not an expression I've heard of. Is the second J really that? I've got several of the theme answers but still haven't spotted the theme itself.
I seem to remember not particularly enjoying Maskarade's last year either.