Sorry it's a bit late, but good luck NAJ78!
PastorHeather- the spacers are the worst part, trust me!

I think most people would agree.
The expander won't hurt, but it will feel odd to your mouth to have this big bulk of a thing in there. Eating will be annoying the first few days until you get used to it, but you
can eat (so long a it's not toffee

). When I first got mine in I got home and tried to eat a sandwich but felt I couldn't physically chew it- of course I could, but you need to get used to it, that's all. As for food getting stuck, persevere and you'll soon find a way to unclog it.
Try interdental brushes to poke things out if a lot gets stuck, swill with water, tilt your head back and the clog will dislodge and slide down to the back of your mouth (gross, but necessary

)
As for the bruising and swelling- I had minimal bruising and maximum swelling, whereas the likes of Brandy had the opposite I believe, so it relly just depends. But it goes- and this is really the only downer, as I was never in any great pain at all. Once you've gotten used to the expander and turning of the expander, it's a doddle (though I still can't wait to have the expander removed, it doesn't irritate me as it did when I wasn't used to it being in my mouth.)
Remember any discomfort or pain is temporary- a healthy, functioning bite (and a gorgeous smile) are not. It's well worth it!