Dishwasher mayhem

[Ghoulish Delight]

So, as most of y'all know, we're replacing our kitchen counter. We're also replacing the ancient diswhasher, but we have bit of a dilemna.

The previous owners put pergo flooring in the kitchen. The flooring (and the pad underneath) was set on top of 2 layers of tile (it's like a linoleum ice-core. Kitchen floors through the decades), so there's a good inch and a half of elevation difference off the slab. That made removing the old dishwasher...challenging. Basically had to pull off the counter top and some moulding. That would make getting the new one in after the new counter is installed even more challenging.

The counter installers (who won't do any sort of plumbing) said it's cool if the dishwasher is already in place when they install. Okay, awesome, we'll get it delivered the day before.

Here's my question. Noting that I'm a total plumbing novice, is there any reason I would need to have a plumber come in to slide the dishwasher into place before the counter gets installed? i.e., does anything behind the dishwasher need to be hooked up or adjusted before sliding it in, or should I be able to have everything that needs to be hooked up accessible from underneath the sink when the plumbers come to hook the whole shebang up? Because once it's in, and once the counter is on, it won't be coming out.

I've glanced at some diy info and it LOOKS like all that would be required is attaching a hose or 2 and maybe a bit of electircal connecting. There even seems to be some "dishwasher kits" that are available with all the hoses and adapters one might need. If it's really that simple, I can definitely do that. Any one have actual experience?