TheHusbandHalf and I decided 3-4 yrs ago to do the bedroom floor. It had been just second story sub floor since 1992. We thought about wood, and then decided that the Armstrong LVP was 'good enough.' (a comment we have used on this house for years). Besides, we were the only ones who were going to see it anyways and to us, it looked like wood.
We used a utility knife and a framing square to score, and then cut the planks. The room is large, so we just moved the bed and other furniture to one side, and then to the other, the next day. I don't think there was a waiting period after putting down the planks before the furniture could be moved, but one side per day was enough for us.
We did not use a floor roller to weight it down and it has looked perfect since.
We left about a 1/4" space between the wall and the plank, and then put a silicone bead in the gap so it would be airtight (outside walls). The baseboard went over that, and then the shoe.
I do not know anything about putting it on concrete.
I think I saw several places online where the product could be bought, though we bought ours from a local store.
We DIY because that's how we do alot of things around here so it was a good decision financially. But we did it mostly because it was easier than wood, which we could have done.
I think if you devoted weekends to it, and were not in a hurry to finish, you would not have to take days off, just do it when you had time.