I have an S9. Its very easy. Granted the Sim slot/holder is smaller and seems flimsier. Just do everything "gently" and you will do fine.
1. Power down the phone completely.
2. lay flat on table
3. Use a paper clip or the tool that cam with your phone to push the release. (Top of phone). Push gently but firmly.....it will release
4. Once released (popped out) pull out the sim holder slowly.....
5. Replace sim as usual.

Also make sure your hands are clean ;-)