I did it last week, when Henry was 6 months. I had reduced the lunch meal slightly and increased breakfast a little, but not massively. Then I just switched - giving him breakfast a little later (8.50am) and dinner around 4 (although I'm trying to make that later, as he's woken up a little earlier). Right now he's clearly starving as he's looking at both of us in that "I'm starving" way. Often he goes into the kitchen and looks at the work-surface, then the bowl, then us, then the bowl agaain. Then looks very very depressed! I'm sticking with it, in spite of the sad looks. I'm sure he'll get used to it eventually. I'm not even sure I'm feeding him enough - I've been giving him a bit less than the BH packet recommends, but he seems healthy enough.
I'm sure Ozzy will be fine - just ignore that hungry look if you can! 2 meals is a lot more convenient for you, especially if you have to go out and leave him for a few hours.