So it turns out I was wrong about needing to click on the tier to see the price in your local currency! Whoops. It's actually displayed automatically, right beneath the actual price. So again, you don't need to worry about including that info in the description itself. :)
I'm not sure what price point you're thinking of when you say you can't afford a trailer, so I can't really offer a lot of specific advice, but I think that's one of the most essential components of a Kickstarter page. It's what people will look for first, and some will click away by default if it's not there.
I'd really, really recommend getting a trailer done, even just a cheap 30-second one like the freelance spot Y Press linked, if it's at all feasible. Better to invest a small amount now than to wonder if it would've helped after a failed campaign, right?
Thanks for listening to my other feedback! Hope we're not overwhelming you with all this. <3