maxwell, they are very easy to set up. I often set mine up alone, and it is a fairly large one. The one part that is helpful to have another set of hands is in setting up the dining fly.
Pete, they don't normally come with floors, although I do think some suppliers offer that as an option. I use the cheapest indoor/outdoor carpet I can find as a floor for mine. A painters tarp also works well. If you use a stove you will need to leave bare ground underneath and in front of it anyway, so a seperate floor works fine.
As far as bugs, we have plenty of those bloodsucking things flying around Wisconsin too. I don't know why, but it really hasn't been a big problem for us. No more than any other tent I have stayed in. I spent a week in a wall tent in Canada one spring when the bugs were fierce and they used the mosquito coils inside the tent and it worked fine.