You can go there for attestation but there is another way. You can assign this task to OCS Courier service. Check their website for more info. They also provide degree attestation service for HEC and MOFA. I have gone through all the processes you have mentioned above. Good Luck.

Matriculation and Intermediate certificates will be tested by IBCC, H-8, Islamabad. And the Degrees above Intermediate from HEC, H-9, Islamabad.
HEC will submit fee at a counter. IBCC will submit fee in adjoining HBL branch.

__________________
Eat, Pray, Love!