I replaced my iPhone 4's speaker closure successfully with this guide. Note that:
1. I skipped Step 13 to 19, which seem to be irrelevant to replacement of speaker closure.
2. I did not pull the battery out. Only disconnect the battery connector.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
No reputation gained yet.