The process of IQAS is quite simple, as you dont have to attest any degrees/transcripts from the HEC, but rather from your university.
1) You fill out their online application form.
2) You pay their fee (you have to pay in advance), after wards your receive your completed application form via email. Your filled out application that you received in email, will have a reference number on the bottom of each page. You will need this number.
3) Print the application form and sign it. Also, fill out the Checklist and print out. Attach colored copies of all your degrees and transcripts you wish to have assessed (No need for matric or inter documents), and a colored copy of your passport bio data page that bears your full name and date of birth. Done with all this, your are ready to send your application package that consists of : 1) signed application form 2) Checklist 3) Colored copies of the documents.
4) Your next step is to either have a duplicate or a colored copy of your transcript verified by your university's controller, and get the Transcipt Request Form signed and stamped by him. Do type in and print your transcript request form, leaving nothing for controller to do as they often dont have time for that. You must not forget to mention your reference number (the one at the bottom of each page of your application form) as otherwise your documents may get lost at IQAS. Once your verified transcript and transcript request form is signed and stamped, ask them to put it in their official envelope and request the controller to sign and seal the flap of envelope. This done, write To IQAS address , and in senders address simply write Controller and university address, as the transcript must be sent by the issuing university. This done, just send the transcript and transcript request form.
5) Once your application package is received by IQAS they will confirm via email and give you a file number for all future correspondence if need be. Similarly once your transcripts reach, they will send another email of confirmation. After that you will have to wait for weeks before they confirm that your process has started. I think nowadays they finish the whole process in 20 business days once they start, but be prepared to wait for over a month or even more. Once the process is finished, they send you a scanned copy of your ECA report that u can use for express entry profile, and within a week you also receive the hard copy via FEDEX.
There is a quicker option of WES also but i have heard some people complain that they often assess the degrees showing less than what the degrees ought to be worth. I have personally no experience with WES so cant really judge. With IQAS i got exactly the evaluation I thought I should have.
Hope this helped.
Best of Luck!