I did Unit 1 Literature last year, but really didn't like it so I moved back to regular English for Unit 2.
The change isn't a huge deal (although it will be a bit more going into Unit 3 from Unit 2 Lit), you just have to learn to adapt to a few different styles of writing. I wrote my first language analysis and first text response in the end of year exam, and didn't do too badly. I only lost marks due to structural issues, as I wrote my text response more in the passage/lit analysis way than the convential essay format.
You kind of have to move back in a sense to year 10 english, and review the TEEL structure and any context/LA you might have done. However, obviously you have to use more sophisticated language and ideas. It's almost advantage doing a little bit of Literature, as you learn to really analyse language, concerns and the context of the text being studied moreso than in English. So bring forward the more complex ideas, but retain a simpler style of writing.
Language analysis is pretty easy to learn. Like I said, I only wrote one last year (and had no idea what I was doing) so I only really learnt how to write them at the start of this year. Same goes for context, you just have to experiment with a few different styles (essay, persuasive speech, story etc) to find the one that suits you, but after you learn how to implement ideas from the prompt into your writing you should be fine.
I'd just practice a bit over the summer, especially LA and Context, maybe post a few essays up here for other people to mark them and get you used to the different structures. You'll probably find English is a hell of a lot easier than Lit... I know I did. Good luck!
EDIT: Intro is VERY formulaic in language analysis, just need to include background info, author, date, where it was published, type of persuasive piece (editorial, opinion, letter etc), target audience, main contention and sometimes overall tone/s of the piece.
It depends what style you do in context how you include the text. Essays can mention the text explicitly, though only using to support your ideas rather than centering your ideas around the text. Stories, articles, letters etc mention the text implicitly in some way. You may decide to use characters from the text in your story, or you may "interview" one of the characters for an article.
Whatever you do, don't make up a story and say that Person X was in the middle of a conflict, so he read a page of <set text> and felt so much better. Kind of tacky...