I'm a strong proponent of learning formal and informal estimation methods - I'd start with Steve McConnell's book "Software Estimation: Demystifying the Black A

I'm a strong proponent of learning formal and informal estimation methods - I'd start with Steve McConnell's book "Software Estimation: Demystifying the Black Art." For estimates that I would put money on, I will estimate in 4 hour blocks and get features down to the most granular level. If I don't understand it at that level, I don't understand it well enough to estimate yet.