To disassemble your Samsung Galaxy S5 mini may be not as difficult as you imagine if you follow the appropriate steps. Here, hytparts.com offers detailed disassembling guides and how to replace the Samsung Galaxy S5 mini Display Assembly.
Make sure you have powered off the smartphone before disassembly.
Step 1: Use a plastic opening tool to insert into the slot between the Samsung Galaxy S5 mini Battery Cover and middle frame plate. Then gently pull off the back cover.
Step 4: Use a plastic opening bar or an opening guitar to separate the front screen and the Samsung Galaxy S5 mini Middle Plate Housing. Please handle it gently because they are still connected by a flex cable.