I met my buddy at the equipment rental place at about 8:15 AM so pick up the concrete saw. Rather than rent a blade for $45 plus $5 per 1000th of an inch usage, I purchased a blade for $89.
After an attempt to create a couple of plastic sheet dams to prevent water from getting to my belongings (an effort that mostly failed, by the way...
), cutting commenced. My friend operated the saw -- my job was to attempt to control the water with a pushbroom. After a couple of hours, we had two very nice cuts over 3" deep! 
He then proceeded to cut the field into sections to make the subsequent break-up activity easier.
At about noon we returned to the rental place. While we were there I rented an electric impact hammer!
I was not very mentally prepared for this step -- I was a bit nervous at the prospect. But, it has to be done, and the worst case would have me trying it out, deciding I wasn't up for the job, and returning it within a couple of hours.Well, that didn't happen -- instead, I came home, had lunch with my wife, and then headed out to the garage to get acquainted with that little beast. I was expecting awkward, heavy, and nerveracking, but what I found was somewhat comfortable, somewhat heavy, and instant gratification! I'll be damned, I'm jackhammering my friggin' garage floor!!
I was pretty slow and meticulous for the first part -- the area along the cuts. I had to exercise caution so as to not chip or crack the concrete that isn't getting removed. I mostly succeeded to that end -- there are a couple of small chips along the edge (oops). I then removed the pieces and stacked them along the side yard fence. That gave me room to start breaking off larger sections along those areas.
By 8 PM I was finished breaking up about half of what needs to be done!
My 24 hour rental is due shortly after noon tomorrow, so if I get started at about 8 AM, hopefully I'll be finished by then. IF not, no huge deal -- I'll just return it late and pay a few hours' extra.I'm really pleased with myself right now -- I'm still somewhat in disbelief that this is actually happening!
Thanks to all who continue to show an interest in this, and especially to those who have encouraged and/or inspired me along the way... I'm sure you know who you are!
--Keith
I had a little difficulty controlling it since it weighed more than I did it seemed that my bouncing feet were breaking more concrete than the tip of the hammer! Just like in the cartoons.