When putting the screen back on an iPad, I've found that the adhesive works better if it's heated up after you place the screen on. The best way to do this is to use the iOpener to provide heat while gently applying pressure to the area of the screen that you are heating
I had a similar problem while working on an iPhone 4S. After trying multiple methods that failed to remove it, I ended up purchasing a screw extractor from Home Depot that worked. The downside is that the extractor has to be put in a drill, but I was able to carefully use it to remove the stripped screw without any problems.
Unfortunately the parts for the iPhone 5 and the iPhone 5S are not compatible with each other so there is no way to mix and match the parts from both phones to make one that works
It sounds like your speakers need to be replaced. You can follow the iPhone 4 Speaker Enclosure Replacement guide if you want to replace it yourself. You can purchase a replacement speaker assembly here: iPhone 4 and 4S Speaker Enclosure
After looking at step 6 of the iPhone 5c Teardown, I do not believe the battery has to be removed from the phone to replace the front panel assembly. Although it does not look like it has to be removed, it is still recommended that you remove the battery connector from the logic board before doing any repairs on your phone.
I have successfully used the iOpener to open an iPod touch, and it worked well. I guess an iSclack could technically be used to open an iPod, but I personally would not use it because of the adhesive. The best way to open it is probably by using the iOpener and prying picks.
First off, try checking the connection between the digitizer cable and the logic board. If it is not connected properly, that could be causing the issue. If that does not solve the issue, you may have to replace the whole screen again since it is possible that the digitizer cable was broken in the process of repairing your iPod.
That should permanently disable wifi without interfering with any other functions of the phone except for bluetooth because the wifi and bluetooth antenna are one part. If it does happen to interfere with something else, you can always reinstall the wifi antenna.
First, try performing a hard reset on your iPod by simultaneously holding down on the power button and home button until you see the Apple logo. If this does not fix the issue, try checking the connection of camera cable to the logic board.
If you have trouble lifting the home button switch up with the plastic opening tool, you can try using an opening pick instead.