You cannot stop the ammonia until you are through with the cycle although the method I used said you cut the ammonia amounts in half when the nitrites appeared. Then when the nitrates appear and you get a 0 on the ammonia, and 0 on the nitrites after 24 hours from when you added the ammonia, you do a 50% water change and can add fish. Don't do that until you have fish ready to add though as until there are fish in the tank to keep the cycle going with the ammonia they put out, you will need to keep feeding it with the pure ammonia.

So 24 hours after adding a dose of pure ammonia:
0 ammonia
0 nitrites
the presence of nitrates
and
Do 50% water change before adding fish.

Then the fish begin to supply the ammonia to keep it going, but be sure not to add too many fish to begin with or you will kill your cycle. 1 or 2 small fish to start and you can add a couple more in a week and in 3 weeks or so if the ammonia and nitrites are still 0 you can add your tank of fish 3 or 4 at a time. Control the nitrates with water changes or the best way, IMHO, is to control nitrates with live plants as well as water changes.

I actually had a very small tank with a small filter cycle in 4 days for a soft cycle and since I was only going to have one fish in there I was able to allow it to finish establishing itself with the fish in the tank with no problem but I had also given it a starter of established gravel in a sock.