45 minutes - 2 hours
My headphone jack was faulty and sound was only coming through one side.
It went well. Here's what worked for me:
TAKING OFF CASE VIDEO:
Using push pins (thumb tacks) to hold the front apart from the back as I removed the case. Those separator pieces that iFixit recommends are not necessary at all. Video: https://www.youtube.com/watch?v=VeF04qKZ...
The clips holding the battery cable and headphone cable in place were so tiny. The battery cable clip slides UP, and the headphone cable rotates 90 degrees, so it becomes vertical.
The hardest part was getting those dang screws out. I bought iFixit's size 00 screwdriver and was very happy with it--especially its magnetic tip.
Big note: Before you unscrew those screws, make sure the grooves of the screw are lined up with the head of the screwdriver properly. I had trouble at first because I tried unscrewing without lining that up, and I stripped the head of a screw. Wound up just yanking that one out and not unscrewing it.
I don't have much fix-it experience. When I got too frustrated (taking off case, removing screws) I left it overnight and had a much better experience in the morning. My iPod works great again now. Thank you iFixit!