I attempted to replace a broken front screen and failed miserably and I will pass on what I learned from it. I can identify several reasons as follows: 1) I was not fully prepared mentally to undertake such a tedious task. I should have anticipated more time and started when I was alert and fully motivated. Instead, I started at the end of the evening when I was fatigued from the day.2) The lighting was an issue. This seems basic but yet I overlooked in my anxiety to get started. And, 3) The screw drivers I was using were poor quality. I seemed to strip about 50% of the screws. Since then. I purchased better tools and have not had this problem.
I was able to replace the charging dock fairly easily BUT I skipped some steps that seemed unnecessary: (1) I did NOT remove the battery. I simply disconnected the battery cable (performing steps 4 and 5). And, (2) I did NOT remove the logic board. I simply removed the dock ribbon cable from the logic board (performing steps 8, 9, and 10).
In summary, I skipped steps 6,7,12,13,14,15,16,17,18,19. I performed the rest of the steps as outline in the guide. Note that I was very careful and taking care to WORK AROUND the battery and logic board with very little difficulty. The phone works perfectly.