Thank you for this guide: very clear and detailed. The dedicated adhesive-cutting tool was well worth the money, as it sped up the cutting and reduced my stress level! I did need to repeat steps 9-16 a few times before the screen felt loose enough to lift away from the body. TAKE YOUR TIME - the screen WILL lift off without much force when it’s ready.
While the case is open, allow a few minutes more to remove the left speaker and carefully remove any dust and fluff that has been sucked into the case by the cooling fan!
I opted for a 2 TB FireCuda drive. Booting up and loading of apps is noticeably faster, for only a few pounds more than a 2 TB traditional HD: a cost-effective solution for an older Mac.