you can but make sure you put about 3 and adding live plants will also help alot during this process make sure you have testing kits and feeding your tank just a few flakes a day will also speed up the process
A snail needs the same water quality as the fish and will produce ammonia waste just like fish. Doing a cycle with a snail in the tank should be treated much the same way as doing a fish-in cycle. As long as you do the water changes to control water chemistry, it can indeed be done with success. Most of us really don't care for that much work though.