Glad it all worked out. My mare was in a trailer accident before I got her, so there was a lot of work to be done there. Now, if she balks, I back her up, get firm & make her do a few circles, then she gets in. Took a long time to figure that one out. I tried the whole 'nice n quiet' thing, and it worked at first, but then she figured out we could do that forever. Now she just gets in, and just occasionally needs the visual aid of somebody standing behind her (doing nothing, except maybe holding an arm out) or, like I said, we do a few little circles.
It's great that now you get the chance to work out any trailer issues, and you'll get to know the horse & if he needs the quiet approach each time, or if a little stern talking to get the point of "get in" accross :)