As others have mentioned, suction cup and tape doesn’t work. I used the blade of a box cutter (watch fingers) and inserted just below and right of home button. Then moved spudger along the crack to tear adhesive/seal. Easy peasy.
Don’t waste your time with the suction cup - it doesn’t work! insert the blade of a box cutter just below the lower screen edge below the home button and gently pry just enough to start cracking the seal.
Excellent guide. My daughter's MacBook Pro had stopped booting up and when she took it to the local Apple Store they recommended replacing the drive. I took the opportunity to upgrade to the 1TB hybrid drive. Easy replacement. I booted up and reinstalled MacOS Lion via WiFi and then upgraded to Sierra. Everything is working fine and now have 900+GB of free space!! Thanks iFixIt folks