To think twice is quite enough.
On a good bargain think twice.
Don't think twice, it's alright.
Every time something pops in my head, I think twice about it and I do it anyway.
I manage to think twice about everything / Why will they like me as they do / Or not as they do / Why will they praise me as they do / Or praise me not not as they do ...
The key to making money is to stay invested.