Earpiece speaker on an iPhone 4 replacement.
The replacement of earpiece speaker went smooth and the iFixit step by step instructions are Great! I read from my iPad as well as looked at photos, the instructions are great and very easy to understand. I will be using iFixit from here on out for all my Apple products repair and look to iFixit for other things I want to repair in the future!
Follow the iFixit instructions and you should be just fine. Read and look at the photos several times before attempting, it makes you much more familiar with what you are doing.