It's hard to say exactly, but if you can work through all the problems in Barber's Bayesian Reasoning and Machine Learning, and some other standard 'frequentist

It's hard to say exactly, but if you can work through all the problems in Barber's Bayesian Reasoning and Machine Learning, and some other standard 'frequentist' stats text, you'd be well placed to get started. My profile says where I work.