toilet training can be a long, tough process, and sometimes the earlier you start the longer it takes imho. I know someone who started at 10 months and she was doing pretty well, but i saw her the other day and her daughter is 3yo and still having 3-4 accidents a week...this gets pretty wearying after a while..nappies are seriously easier i think.
there is no harm in starting but i think it will be harder work for you in the long run...