So idk where your get your stuff serviced, but, where I am in the US it will cost at least 100 dollars to replace this part. If the glass back breaks in the process, a lot more. Phone companies have shown we can manufacturer phones with same quality, same features, same durability, and still have a serviceable battery. We can screw instead of glue the thing together.

Paying someone 10 dollars isn't bad, but, thats typically not the case. As I mentioned about the glass backs they can break easily no matter how good you are.