Brute force is the best hacking method to an email account  as chances of getting password is very high.The methods is very simple . But this method is cumbersome. Still most hacking software use this method due to high success rate .

This is how you do it. All that u need is the username and findout what is the max password length the software/site allows and also the minimum. say the minimum is 6 and max is 8. You have to start trying out all the combination.First all the six letter combos then seven then 8