30 minuten - 1 uur
Original battery was dying so I put in a new one.
It went well! Took me about 40-60 minutes in total. The old battery was VERY difficult to remove and I ended up destroying it in the process.
I skipped steps 11-16 and that worked pretty well from me. On another commenter's advice, I simply used some packaging tape to tape onto the top of the screen, over the top of the phone, and onto the back of the phone to hold the display at a right angle to the rest of the device. Saved me all the trouble/risk of disconnecting the display, but if you use this method you should be VERY careful not to hit the display while removing the battery .