the OP refers to this in the past tense, ie that the formica is already installed. Unfortunately, this is poor planning. Knowing that you were going to replace it within a year, the better thing to have done would have been to put down a sheet of plywood and then paint it or cover it. It might have even served as a base for 2cm granite. But if it is already there then it depends on how they mounted it. If it was glued to the cabinets and to the back wall, it will be messy and perhaps damaging to remove it. If it was simply screwed in, then it should come out without too many issues. As stated, you need to think about the sink. Appliances should not be a problem any more than an original installation would be. That is, you'll need something for attaching the DW to the counter or attach the DW to the cabinet sides.

I got the sink installed, it took longer then I thought it would. Getting the old one out was a piece of cake. The granite double bowl sink fit perfectly but mounting clips were a nightmare. I thought I could use the one I had taken off the old sink but plastic portion had crack. I got new ones but they didn't work neither did any of the mounting clips I bought. After wasting a day on this I finally called Swanstone and they sent me the ones I needed. I had been told that most people don't even bother with them, they just use the silicone to keep in place. I had put the silicone on first as instructed so it was already sealed by the end of the first day. I tried to use the clips that Swanstone sent me but after spending 45 minutes on one clip. I ended up using the silicone on the underside to make sure there were no leaks from the counter. Day two, I finished hooking up the lines and trying to seal the basket strainer drain and disposal flange. You'll not allowed to use plumber putty on anything just silicone which does take time to dry. Not being the patient type, tried to rush the process and ended up having to the whole thing over. Day 3 was hooking up the garbage disposal and the rest of the pvc plumbing parts. I can't tell the number of trips I made to the hardware store for parts and to have some of those parts cut for me because I suck at it. The last headache was the p trap that kept sliding down when it filled with water. I thought I got it until I ran the dishwasher and it leaked again. So I used teflon tape and really tighten it, so far so good. I did get a waste king garbage disposal that didn't work with the nice disposal flange I had gotten because it was an ez mount and not a 3 bolt that I had expected. Thank goodness, I found this out before I had bother to install the sink or it would have been a really big mess. I did have to replace the Opella with Trim to the Trade but it turned out much nicer. For the main sink, I got a commercial grade oil rubbed bronze sink strainer drain.

I don't have any professional experience but this is basically what I remember from my previous granite install in our old house 2 years ago. 1) the sink sat on the cabinet underneath and was siliconed to the countertop 2) just like you the small section was glued but the longer run wasn't. We didn't have an island. I might be remembering wrong, and I can't speak to the island, but I think the rest is OK

Ours drilled 3 holes in our granite last week, but they had a hose hooked up to the tool, and the dust went right into the shop vac type of thing. They wiped the counters and under the sink off afterwards, and I did so again when they left, just b/c I wanted my new counters to be clean, but there wasn't much for me to wipe. I would ask what their process is, so you don't have dust everywhere, but I don't know that I'd worry beyond that.