it all depends on what u think villains will call u with.. This is where a bit of study with pokerstove and knowing a bit of maths comes in and u can work out your push ranges for the future.
Ok if u knew the 2 villains behind were tight with there call ranges in this situation [all on how deep villains are,what pot odds they are getting and your image/how they perceive your ability] say they call with the top 10% hands - 77+,A9s+,KTs+,QTs+,AJo+,KQo by just knowing this u can work out how often they will fold..
So they fold 90% , with 2 behind all u do is multiply 90% by 90% to get approx times they fold..
so 0.9 x 0.9 = 0.81 which is 81% the pot is 1350 and they fold 4 out of 5.... 4 x 1350 = 5400 so not to hard push 74o here because the 1 time out 5 u get called by this range u win 1 in 4 ... all this = +cEV
If they call loose with 22+,A2s+,K2s+,Q6s+,J8s+,T8s+,97s+,87s,A2o+,K8o+,QTo+,JTo,T9o - 36% of hands then your push range to be profitable would be 22+,A2s+,K9s+,QTs+,A3o+,KTo+ why? because 64% of the time they fold so 0.64 x 0.64 = 40% so u know u have to push a range that is above 50% to be definite +ev..
It is just a case of putting in the study and getting to know your ranges [how they play against one another] and the basic maths behind it.. All failing that go on say 2+2 in the probability forum and ask the egg heads there
although u may get some heavy maths thrown back they may direct u to a excel pushbot sheet that would help with the calculations on shove ranges...