I don't think there is a formula I can give you in order to successfully steal your opponent's blinds.Surely it is a vital play you should incorporate in your game if you want to enjoy some deep runs and maintain a relatively healthy stack!
Some things you should take into consideration before try stealing are down below:
-your late position image , how tight or aggressive your opponets think you are
-your opponents blinds , you don't want try stealing with a marginal hand of yours from an opponent who has a shovable stack (a stack which cannot 3bet with, so his only +EV move is the all in)
-how passive / tight are the players on the blind
-later positions are the perfect for widening up a little bit your range because you will have position against any defender from the blinds!
-stage of the tournament , some opponents tighten extremely near bubble , this is the time you should exploit that but ok not in every orbit!
If you keep open raising from LP in every orbit then a good opponent will fight back , so try to keep everything balanced.