First of all, we don't need any Mullahs to tell us what to do, especially Kharijis like TTP and this Lal Masjid terrorist.
Now coming to the issue of enforcement of Sharia'ah, it is very easy, and yet difficult at the same time, there's no big hurdle in enforcing Sharia'ah, there's no difference of opinion between any sect in Pakistan on that, leading scholars of all the sects gathered in 1951 and passed 21 points on which they all agreed and then they asked Government to enforce Sharia'ah based on those points. There was and stll is complete consensus!
Problem comes at the part of government, we need to understand, first we have to make a environment for Sharia'ah law, I mean, you can't blame the youth for going towards adultery if you're already providing them with enough resources to be attracted towards it, first of all, the environment must be made suitable, that too slowly, not immediately, like the TTP and even Afghan Taliban. That's a grave mistake.
I heard Zaid Hamid talking about this issue, he raised some valid points, we can start from implementing Islamic economic system first, the main thing Quiad e Azam M. Ali Jinnah wanted, then Islamic Judicial system, social changes can then follow etc etc.
Basic is the Justice and equality, the main principles of a Islamic system.
