The tile area is 4' by 5' how close should i go to the toilet flange in the floor. The floor near the flange is a tad higher then the rest of the floor, how can I make it all level when setting the tile?

Hello, I have a 15x14' room upstairs with 14x14" porcelain tiles that are laid directly on the wood subfloor that I would like to remove. I removed 1 tile by hand by using a chisel and hammer. I chiseled out all the grout, then pried up the tile. It came up pretty easily and in 1 piece. About half of the mastic stayed stuck to the wood subfloor but it seemed pretty easy to scrape off. Only a little bit of the wood came with it in a couple small spots. Obviously I want to get this done faster, so I am wondering what would be the best way to go about this. I was thinking A. Buy a dremel multimax and grout removal blade ($130 total) and grind out all the grout around the tiles. Then buy a hand scraper and pry up all the tiles and scrape away the mastic. Then buy a leveling compound and fill in the holes in the wood. B. Rent a 25# demo hammer from home depot and go to town ($60 for the day) Option B would seem to be faster and cheaper, but messier and also I am concerned with damaging the wood subfloor with the demo hammer. I don't want the grout to pull up the wood or chip it with the chisel bit. I plan to lay carpet on it when I finish. As for option A I also don't know if a grout blade for the dremel would last on the entire room. Are there any other options or do you think I would be able to do option B without damaging the wood floor? Thanks