Forcing tomatoes to ripen by stopping watering them

I think the recommendation is to reduce watering rather than stop watering, but I have never mastered it. The sight of anything wilting forces the nurturer in me to water it. I have a habit of over watering. The other problem I have is deciding when a flower truss is far too late to ever ripen into fruit and therefore should be pruned off. There's always that little voice that says 'leave it, we may have a hot autumn, give it a chance' whereas I know in my heart the wise thing would be to accept the weather will turn nasty and there's no hope of those flowers being a tomato ever and chop it off.