The first thing you have to do is get your degree notarized by the HEC (Higher Education Commission) in Pakistan. This ensures your degree is genuine and from an institution that's accredited.
Next, you need to validate the HEC stamp from the Ministry of Foreign Affairs (MOFA).
Once you have done this, if required - you may want to translate the documents to English; however this is rarely required as most certificates in Pakistan are already in English.
Once you land the US, you need to visit the Pakistan consulate and have them validate the stamp of the MOFA in Pakistan; this ensures that the stamps are genuine.
Next you need to validate the degree to get your equivalency (this may or may not be required). To do so, you need to visit any number of NACES certified members which will provide your equivalency for the US.