Need some help with heads up play

[davekngs]

Ok, I have been doing reasonably well playing $10+1 SNG's making atleast a small profit but I rarely place 1st as my heads up skills are not good. I even finished 2nd in a 200 multi table on william hill last week with after dominating the final table and find this leak in my game very frustrating. My problem is with the tournament structure how it is in SNG's and MTT final tables the blinds are very high. I mean it is usual to have 5k each in chips and the blinds to be at 400-800 and 600-1200. I either play too aggressively trying to steal and defend blinds or I play slightly more passively and my stack disappears. Can anyone offer me any advice that may improve my chances of winning heads up, thanks