"Coarticulating" the /g/ and /n/ is the trick to fluent pronunciation of these two sounds. Don't release the /g/ before starting the /n/.
Transcripts available on Pronuncian.com
Nov 2016
221: Compare ’unvoiced th’ to /f/, /s/, and /t/
How to pronounce words like "thin/fin," "mouth/mouse," and "both/boat." Perfect your English fricative sounds by never stopping the air from passing through your mouth. Transcripts at pronuncian.com
12m 43s