I needed more disk space on my MacBook and the battery was near the end of its lifetime so naturally I went to my IT department head for help. The good news is I convinced him to purchase the repair parts I needed and I agreed to do the work myself with the help of your excellent repair guides. The IT department said they even had all the tools I needed for the job. Bonus. So I did not bother to review the guides ahead of time.
Once the new battery and HDD came in (from iFixIt by the way) I carved out some time in my schedule to do the swap. I backed up my machine and printed out the repair guides from your site. My IT guys said, 'Oh you will need this tri-tip screw driver to get the battery out'. Ok so that with a set of torques and a small set of phillips in hand and I was ready to do the job. Bad news, once I opened the case I see its not a tri-tip but a pentalobe tip screw driver was needed. Ugh. I should have looked at the guide ahead of time! I then closed up the case and got back on your site and ordered the recommended Retina MacBook Pro Pentalobe P5 screwdriver and waited the few days for it to arrive. Bad news. The tip was too small for the the application! Luckily I had enough forethought to order the Pro Tech Toolkit at the same time. This had several sized P5 tips in the set with the right one to get the job done. The swap of the battery and the HDD was quick (about 15-20 minutes) and easy with the correct tools. Within 3 hours (total) I had my system completely rebuilt from Time Machine backup and was back to work. The Pro Tech Toolkit was well worth the money and now our IT department has a better set of tools then the hodgepodge collection I was pointed to (I should have kept the set hidden away for myself in my office…).
Don't try to take out the P5 screws with the alternate 1.5mm standard (flathead) screwdriver mentioned in the repair guides. These screws have lock tight on them and have very soft heads, it is very easy to strip the head. Make your life easier, use the proper tools for the job.