Remove the back cover.

If your back cover is still sticking to the frame, slide the pick around the edges of the phone until the back cover completely separates.

During reassembly:

This is a good point to power on your phone and test all functions before sealing it up. Be sure to power your phone back down completely before you continue working.

Remove any adhesive chunks with a pair of tweezers or your fingers. Use some high concentration (over 90%) isopropyl alcohol to wipe away any adhesive residue.

If you're using Samsung custom-cut adhesives, follow this guide.

If you're using double-sided tape, follow this guide.