oven/range problem during countertop install

Installing my new countertops was going great, until I realized I had a problem. Cutting the hole out for sliding the stove/oven in isn't an issue, but the old countertop was square on front, the standard laminate countertop with a 3/4in x 1 1/2in square board nailed on. The new countertop has the waterfall edge (rounded top edge). It also extends about 3/4 further than the old countertop did because of the waterfall edge. The first issue is that the stove is setup for a square edge and the new one is rounded on top. The second issue is that the whole appliance will he held out 3/4in by the countertop. What do I do? I have not even cut the hole out of the countertop yet, as I don't know what I'm supposed to do to make the oven fit right.