I was pretty sure I could do it and I didnt want to pay all that money to someone else to do it.
The ipod touch 2nd Gen went great. That was pretty easy.
The ipod touch 4th Gen stressed me out... A LOT! I even had to put it down and come back to it later with a clear head. But once I did that i was able to power through and get a good repair.
There is a metal bracket attached to the front panel assembly on the ipod touch 4th Gen that must be removed and put on the new panel before assembly but that wasn't in your instructions. The only reason I realized this was from the YouTube video I watched on this matter.
iPod touch (Gen 2) LCD
iPod touch (Gen 2) Front Panel Assembly
iPod touch (4th Gen) Screen