I looked into a shot blaster and decided that a scarifier would do my job better. I, without any help, at the age of 65, did my 1300 sq. ft., sealed concrete, below grade, basement floor. I made a total of 8 passes over the floor, plus some spot leveling here and there. If you check out some of my threads and posts, there is plenty of information and even a picture of my grandson with the scarifier. The shotblaster is big and heavy and takes some skill to operate. It might even be too big to get down into your basement, unless of course, you have a walk out basement. The scarifier was manageable. I purchased mine used, on e-bay. My scarifier is electric, thus no fumes. I did not use any water with it. I hooked the 2" vacuum hose to the machine and sucked up the dust and blew it outside. I wore an appropriate respirator, although there was very little visible dust from the scarifier.. Neither the shot blaster nor the scarifier will get right up against the walls. For that you need an angle grinder, with a dust shroud, hooked to the vacuum system. Diamond wheel of course. I sure would not like to do an entire floor with an angle grinder.
I decided to buy the scarifier machine. That way, I could work at my own pace. It was a very wise decision. If, after you finish with your research, you feel that this type machine will meet your needs, drop me a line. I have to pick up a wood stove in Vermont, and you are along the way.
While you might be able to do the job yourself, it is definitely hard, time consuming work. Good luck.
