Yes, this mod is totally easy if you just step back once it's open, take a deep breath, and see how the new battery is going to fit being twice as thick. I just used an exacto knife to cleanly carve away the plastic piece that covers the top part of the battery enough so that piece slides past the corners of the battery and allows the frame to connect. Before you put it back together, make sure you haven't squished any of the spring-like connections at the top. If so, just spring them back up a bit so they'll make a solid connection when you snap the back on. This will solve any potential speaker issues. I doubt the tape is meant as any sort of heat sink or anything, just something that would make sense to tape down during the manufacturing process - also the back is a flexy piece of kevlar so it would help give the back a firm feel stuck to the battery like that. I easily peeled mine off the old battery and stuck it onto the new one. It's not going to make a difference either way. Get a battery, a torx driver, and get this done. It could not be easier. Once you see under the cover of this phone it all just makes simple sense.